Noticed when testing T6188:
If you copy a public key block into the notepad in Kleopatra and click on "sign/encrypt notepad" you get the message "Encryption failed: General error".
Debugview:
```
[7448] org.kde.pim.kleopatra: GpgME::DecryptionResult(
[7448] error: GpgME::Error(117440513 (Allgemeiner Fehler))
[7448] fileName: <null>
[7448] unsupportedAlgorithm: <null>
[7448] isWrongKeyUsage: 0
[7448] isDeVs 0
[7448] legacyCipherNoMDC 0
[7448] symkeyAlgo: ?.?
[7448] recipients:
[7448] )
[7448] GpgME::VerificationResult(
[7448] error: GpgME::Error(117440513 (Allgemeiner Fehler))
[7448] fileName:
[7448] signatures:
[7448] )
```