qa_crowbarsetup: do not try to continue with broken JSON
qa_crowbarsetup: do not try to continue with broken JSON

this could have avoided some hours of debugging for bnc#920232

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