How to reproduce:
- Set OpenPGP keyserver to none in Kleopatra's config dialog.
- Open the details of an OpenPGP certificate and click Update.
Expected result: No keyserver lookup is performed.
Actual result: No change is reported for the keyserver lookup.
That "no change" instead of an error is reported is caused by T7036: gpgme: gpgme_op_receive_keys does not return an error if keyserver lookup is disabled, but Kleopatra should just skip the keyserver lookup if the keyserver is set to none.