Superfluous return

[frozencemetery]

When the -x with dmenu is canceled (e.g., with escape, as if it were hotkeyed and pressed by accident), it still generates a newline. There is no way to avoid this if the binding is accidentally pressed. This is the result of dmenu's null exit condition being the null string. We should special case it, and react accordingly.

[frozencemetery]

This was fixed by @sjindel when crypto was added.