qt: Do not set empty base DN as query of keyserver URL
qt: Do not set empty base DN as query of keyserver URL

* lang/qt/src/qgpgmenewcryptoconfig.cpp (parseURL): Only set non-empty
base DN as URL query.
--

This makes it possible to differentiate an unset query from an empty
query.

GnuPG-bug-id: 5465

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme