Empty fields break JS

[kjac]

If I have a simple text field in multiple languages, and I empty the value of the text field in all languages, the Vorto JS breaks when publishing twice in a row.

Steps:

• Open the JS console :)
• In a Vorto datatype wrapping a simple text field, clean out all values in all languages and hit save and publish.
• Hit save and publish again.
• The console logs JS errors.

I think it's the assignment of undefined that causes the issue. If you replace undefined with {}, it seems to work just fine.

[dawoe]

I created a PR in this issue that fixes it for me #58

[mattbrailsford]

Should be fixed in 97d9020 / 075b9cf