Passing nil proof in MsgAddFinality vote leads to Panic`

[KonradStaniec]

Nil pointer from here:https://github.com/babylonchain/babylon/blob/dev/x/finality/types/msg.go#L29

        	            	goroutine 44 [running]:
        	            	runtime/debug.Stack()
        	            		runtime/debug/stack.go:24 +0x64
        	            	github.com/cosmos/cosmos-sdk/baseapp.NewBaseApp.newDefaultRecoveryMiddleware.func5({0x107b87ee0, 0x109de6b00})
        	            		github.com/cosmos/[email protected]/baseapp/recovery.go:74 +0x24
        	            	github.com/cosmos/cosmos-sdk/baseapp.NewBaseApp.newDefaultRecoveryMiddleware.newRecoveryMiddleware.func7({0x107b87ee0?, 0x109de6b00?})
        	            		github.com/cosmos/[email protected]/baseapp/recovery.go:42 +0x38
        	            	github.com/cosmos/cosmos-sdk/baseapp.processRecovery({0x107b87ee0, 0x109de6b00}, 0x140037b7558?)
        	            		github.com/cosmos/[email protected]/baseapp/recovery.go:31 +0x38
        	            	github.com/cosmos/cosmos-sdk/baseapp.processRecovery({0x107b87ee0, 0x109de6b00}, 0x140037b75b8?)
        	            		github.com/cosmos/[email protected]/baseapp/recovery.go:36 +0x60
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).runTx.func1()
        	            		github.com/cosmos/[email protected]/baseapp/baseapp.go:837 +0xec
        	            	panic({0x107b87ee0?, 0x109de6b00?})
        	            		runtime/panic.go:770 +0x124
        	            	github.com/babylonchain/babylon/x/finality/types.VerifyFinalitySig(0x1400511ad20, 0x14001d88090?)
        	            		github.com/babylonchain/[email protected]/x/finality/types/msg.go:29 +0x2c
        	            	github.com/babylonchain/babylon/x/finality/keeper.msgServer.AddFinalitySig({{{0x108125020, 0x14001d88090}, {0x1080c89f8, 0x14001796e48}, {0x1081229b0, 0x1400162b730}, {0x1080c8678, 0x1400162b7a0}, {0x14000e82090, 0x2a}}}, ...)
        	            		github.com/babylonchain/[email protected]/x/finality/keeper/msg_server.go:107 +0x488
        	            	github.com/babylonchain/babylon/x/finality/types._Msg_AddFinalitySig_Handler.func1({0x108108660?, 0x14006ae1410?}, {0x107ffc360?, 0x1400511ad20?})
        	            		github.com/babylonchain/[email protected]/x/finality/types/tx.pb.go:544 +0xd0
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*MsgServiceRouter).registerMsgServiceHandler.func2.1({0x108107988, 0x14005ac4708}, {0x140037b8c18?, 0x105853bf0?}, 0x358?, 0x14006bc6948)
        	            		github.com/cosmos/[email protected]/baseapp/msg_service_router.go:175 +0x98
        	            	github.com/babylonchain/babylon/x/finality/types._Msg_AddFinalitySig_Handler({0x10808f1e0, 0x1400252a7d0}, {0x108107988, 0x14005ac4708}, 0x1080b5a68, 0x1400061e1c0)
        	            		github.com/babylonchain/[email protected]/x/finality/types/tx.pb.go:546 +0x148
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*MsgServiceRouter).registerMsgServiceHandler.func2({{0x108108660, 0x14006ac1920}, {0x108125a30, 0x14005aaf100}, {{0x0, 0x0}, {0x14001dfe3b0, 0xa}, 0x10, {0x358c8ea0, ...}, ...}, ...}, ...)
        	            		github.com/cosmos/[email protected]/baseapp/msg_service_router.go:198 +0x2b0
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).runMsgs(_, {{0x108108660, 0x14006ac1920}, {0x108125a30, 0x14005aaf100}, {{0x0, 0x0}, {0x14001dfe3b0, 0xa}, 0x10, ...}, ...}, ...)
        	            		github.com/cosmos/[email protected]/baseapp/baseapp.go:1010 +0x170
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).runTx(0x14001b10b48, 0x2, {0x14002474780, 0x128, 0x128})
        	            		github.com/cosmos/[email protected]/baseapp/baseapp.go:948 +0xc78
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).Simulate(...)
        	            		github.com/cosmos/[email protected]/baseapp/test_helpers.go:28
        	            	github.com/cosmos/cosmos-sdk/x/auth/tx.txServer.Simulate({{{0x0, 0x0, 0x0}, {0x10812dc98, 0x14001e78fc0}, 0x0, {0x14000e019c0, 0xa}, {0x10814e9b0, 0x14000e05e40}, ...}, ...}, ...)
        	            		github.com/cosmos/[email protected]/x/auth/tx/service.go:98 +0x10c
        	            	github.com/cosmos/cosmos-sdk/types/tx._Service_Simulate_Handler({0x107f31b60, 0x140013fe5a0}, {0x108107988, 0x14005ab4a88}, 0x14006bc6618, 0x0)
        	            		github.com/cosmos/[email protected]/types/tx/service.pb.go:1436 +0x1c0
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*GRPCQueryRouter).registerABCIQueryHandler.func1({{0x108107c28, 0x10a004060}, {0x108125a30, 0x14005aaef80}, {{0x0, 0x0}, {0x14001dfe3b0, 0xa}, 0x10, {0x358c8ea0, ...}, ...}, ...}, ...)
        	            		github.com/cosmos/[email protected]/baseapp/grpcrouter.go:109 +0xc4
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).handleQueryGRPC(0x14001b10b48, 0x14001e78ff0, 0x140059d5000)
        	            		github.com/cosmos/[email protected]/baseapp/abci.go:1139 +0x140
        	            	github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).Query(0x14001b10b48, {0x107cf8820?, 0x140037be9f8?}, 0x140059d5000)
        	            		github.com/cosmos/[email protected]/baseapp/abci.go:177 +0x520
        	            	github.com/cosmos/cosmos-sdk/server.cometABCIWrapper.Query(...)
        	            		github.com/cosmos/[email protected]/server/cmt_abci.go:24
        	            	github.com/cometbft/cometbft/abci/client.(*localClient).Query(0x1400160d160?, {0x1081084a0?, 0x10a004060?}, 0x113c943a8?)
        	            		github.com/cometbft/[email protected]/abci/client/local_client.go:106 +0xe8
        	            	github.com/cometbft/cometbft/proxy.(*appConnQuery).Query(0x14001449620, {0x1081084a0, 0x10a004060}, 0x140059d5000)
        	            		github.com/cometbft/[email protected]/proxy/app_conn.go:181 +0x130
        	            	github.com/cometbft/cometbft/rpc/core.(*Environment).ABCIQuery(0x1400020e488, 0x1049d587c?, {0x14006747fb0, 0x23}, {0x140023df180, 0x12b, 0x280}, 0x0, 0x0)
        	            		github.com/cometbft/[email protected]/rpc/core/abci.go:22 +0xcc
        	            	reflect.Value.call({0x107bff4e0?, 0x14000e81380?, 0x140037bf358?}, {0x106ef2c94, 0x4}, {0x14001a92a00, 0x5, 0x1056ec880?})
        	            		reflect/value.go:596 +0x970
        	            	reflect.Value.Call({0x107bff4e0?, 0x14000e81380?, 0x2a9?}, {0x14001a92a00?, 0x1080a9ca0?, 0x0?})
        	            		reflect/value.go:380 +0x94
        	            	github.com/cometbft/cometbft/rpc/jsonrpc/server.RegisterRPCFuncs.makeJSONRPCHandler.func3({0x1080fb0e0, 0x140036d55a8}, 0x140057257a0)
        	            		github.com/cometbft/[email protected]/rpc/jsonrpc/server/http_json_handler.go:108 +0xa54
        	            	github.com/cometbft/cometbft/rpc/jsonrpc/server.RegisterRPCFuncs.handleInvalidJSONRPCPaths.func4({0x1080fb0e0?, 0x140036d55a8?}, 0x140037bf8a8?)
        	            		github.com/cometbft/[email protected]/rpc/jsonrpc/server/http_json_handler.go:140 +0x5c
        	            	net/http.HandlerFunc.ServeHTTP(0x14001c6bdd0?, {0x1080fb0e0?, 0x140036d55a8?}, 0x10492a7ec?)
        	            		net/http/server.go:2166 +0x38
        	            	net/http.(*ServeMux).ServeHTTP(0x140008dc6c0?, {0x1080fb0e0, 0x140036d55a8}, 0x140057257a0)
        	            		net/http/server.go:2683 +0x1a4
        	            	github.com/cometbft/cometbft/node.(*Node).startRPC.(*Cors).Handler.func9({0x1080fb0e0, 0x140036d55a8}, 0x140057257a0)
        	            		github.com/rs/[email protected]/cors.go:236 +0x19c
        	            	net/http.HandlerFunc.ServeHTTP(0x0?, {0x1080fb0e0?, 0x140036d55a8?}, 0x104e768ac?)
        	            		net/http/server.go:2166 +0x38
        	            	github.com/cometbft/cometbft/rpc/jsonrpc/server.maxBytesHandler.ServeHTTP({{0x1080c9a60?, 0x14000eaa6a0?}, 0x8?}, {0x1080fb0e0, 0x140036d55a8}, 0x140057257a0)
        	            		github.com/cometbft/[email protected]/rpc/jsonrpc/server/http_server.go:256 +0xec
        	            	github.com/cometbft/cometbft/rpc/jsonrpc/server.Serve.RecoverAndLogHandler.func1({0x1080f4030, 0x140033a28c0}, 0x140057257a0)
        	            		github.com/cometbft/[email protected]/rpc/jsonrpc/server/http_server.go:229 +0x1dc
        	            	net/http.HandlerFunc.ServeHTTP(0x10?, {0x1080f4030?, 0x140033a28c0?}, 0x140033a28c0?)
        	            		net/http/server.go:2166 +0x38
        	            	net/http.serverHandler.ServeHTTP({0x1080dcca0?}, {0x1080f4030?, 0x140033a28c0?}, 0x6?)
        	            		net/http/server.go:3137 +0xbc
        	            	net/http.(*conn).serve(0x1400194b0e0, {0x108108660, 0x140010ff2f0})
        	            		net/http/server.go:2039 +0x508
        	            	created by net/http.(*Server).Serve in goroutine 392
        	            		net/http/server.go:3285 +0x3f0
        	            	: panic [cosmos/[email protected]/baseapp/recovery.go:72] with gas used: '39798': unknown request