qa_crowbarsetup: Do not fail when there's no manila proposal
qa_crowbarsetup: Do not fail when there's no manila proposal

"false && foobar" is still giving an exit code of 1. We have the same
here, and this makes qa_crowbarsetup fail.

gosipyan/automation,gosipyan/automation,vmoravec/automation,SUSE-Cloud/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation,vmoravec/automation,vmoravec/automation,SUSE-Cloud/automation,vmoravec/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,aspiers/automation,SUSE-Cloud/automation