github-status: do not raise if list of prs is empty
github-status: do not raise if list of prs is empty

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