non-string marking causes import crash

[wlhunt]

What appears to be temporary or pre-initialization marking, that's stored in the db, causes the import process to fail.

Stored models with a marking set to an empty python string are not processable through the archive system. The import process crashes upon discovery of a marking stored as [].

Here's an example model:

{
"_id": "a05dba96ee324e5690a146bac03666ed",
"_rev": "2-6352825fa40d3d1825dae970198be0a6",
"bookmark": "none",
"type": "model",
"model-type": "timeseries",
"marking": [],
"project": "51186573a65bba04739b6956db001663",
"created": "2022-03-16T21:33:24.532602",
"creator": "barbie",
"name": "Lobotomy Study III",
"description": "partial frontal",
"artifact-types": {},
"input-artifacts": [],
"state": "waiting",
"result": null,
"started": null,
"finished": null,
"progress": null,
"message": null
}

[Mletter1]

looking into this