fix unexpected eslint error with eol-last rule

cherry-pick and squash of es-analysis#200 by @JSlain
- Fix Issue es-analysis#198
- Fix test

lib/plato.js

@@ -114,15 +114,15 @@ exports.inspect = function(files, outputDir, options, done) {
 
         var fileShort = file.replace(commonBasePath, '');
         var fileSafe = fileShort.replace(/[^a-zA-Z0-9]/g,'_');
-        var source = fs.readFileSync(file).toString().trim();
-        if (!source) {
+        var source = fs.readFileSync(file).toString();
+        if (!source.trim()) {
           log.info('Not parsing empty file "%s"', file);
           return;
         }
 
         // if skip empty line option
         if(options.noempty) {
-          source = source.replace(/^\s*[\r\n]/gm ,"");
+          source = source.replace(/^\s*[\r\n]/gm ,"").trim();
         }
 
         // if begins with shebang