If no options passed from the template, a widget should default to options provided in its index.js

[stuartromanek]

If we decide not to do this, we should be more explicit about it in the documentation.

Edit: use case https://stackoverflow.com/questions/47099783/options-for-areas-in-apostrophe-apos-widgets/47105098#47105098

[dniccum]

I am experiencing the same issue.