Sublime Settings: Fix default completion of empty default string
Sublime Settings: Fix default completion of empty default string

If the `default` is an empty string it is not None but has nothing to offer.

This causes a value like "font_face" being completed with `\t  (default) str`

SublimeText/AAAPackageDev,SublimeText/AAAPackageDev,SublimeText/PackageDev