1.2: Some changes

* I removed the empty option at the top. If the field isn't required PW will add it by itself - otherwise (if required) there shouldn't be an empty field
* There was a bug that if you don't define key + value it shows an empty select field. Corrected this (see line 58-60)
Merge pull request #2 from NicoKnoll/patch-1

1.2: Some changes