Error updating case

[npratley]

Have just noticed that in #50 I seem to have broken case creation. The test-case-create.py script fails with:

ko: 400/{"tableName":"case","type":"AttributeCheckingError","errors":[[{"name":"case.updatedAt","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.updatedAt: {"type":"JsonInputValue","value":null}"},{"name":"case.caseId","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.caseId: {"type":"JsonInputValue","value":null}"},{"name":"case.id","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.id: {"type":"JsonInputValue","value":null}"},{"name":"case.createdAt","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.createdAt: {"type":"JsonInputValue","value":null}"},{"name":"case.createdBy","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.createdBy: {"type":"JsonInputValue","value":null}"},{"name":"case.updatedBy","value":{"type":"JsonInputValue","value":null},"type":"UnknownAttributeError","message":"Unknown attribute case.updatedBy: {"type":"JsonInputValue","value":null}"}]]}

Sorry @nadouani I didn't run the test scripts before submitting the change.

Rather than setting these attributes to None it may be best to only add the attributes if they exist in the 'json' parameter, or modify create_case to exclude them. I can fix that up.

[nadouani]

No problem, I'll revert back the changes made on #50