UiConstructor not working correctly

[jhickman]

Created on behalf of @treblereel

As mentioned in PR #30 , if a widget has a @UiConstructor, the generated output is incorrect.

I (justin) was able to reproduce this issue locally. It is due to the creator variable being non-null, but not realizing it's because of a @UiConstructor and thinking it's a @UiFactory. That's why the output is something like owner.<init> because "" in this case is the simple name of the method (constructor in this case).