Fix that pass generate could generate a location with only whitespace as name

[poettig]

Soft-depends on #2 because of code changes there (the icon factory with self), but should technically work without it.

[okaestne]

In what case will that happen? Can you give me an example?

Edit: Oh I see, just the query pass generate (with zero or more trailing spaces) will create a new .gpg file. It will even break pass ls because it will print the password of the generated .gpg file instead.