D9672: Don't emit error signal before we tried all list commands.

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R241 KIO

BRANCH
  fix-ftp-list

REVISION DETAIL
  https://phabricator.kde.org/D9672

To: wcpan, dfaure
Cc: ngraham, cfeck, #frameworks, michaelh