Merge branch...

Merge branch '151-mkarchiso-should-show-code-signing-certificates-none-if-no-keys-cerfificates-are-specified'

* 151-mkarchiso-should-show-code-signing-certificates-none-if-no-keys-cerfificates-are-specified:
  mkarchiso: show "Code signing certificates: None" if no keys/certificates are specified
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