Enhancement for the Exception handling

[wewoor]

Some unexpected Errors could lead the page blank white screen;

Case:

item data:

{"id":"fixedTab","name":"FlinkSQL","data":{"value":"select * from abc;e","language":"flinksql"},"value":{"code":"select * from abc;e","message":"extraneous input 'E' expecting <EOF>","startLineNumber":1,"startColumn":18,"endLineNumber":1,"endColumn":1,"status":8}}

molecule.problems.addProblems(item)

The item lacks the children property:

This Picture comes from ProblemsService added some unknown or incorrect type of data.