Fix #1731, groups with no apps are ignored by all_apps_ready
Fix #1731, groups with no apps are ignored by all_apps_ready

mytestbed/omf,phelipealves/omf,mytestbed/omf,LABORA-UFG/omf,LABORA-UFG/omf,mytestbed/omf,LABORA-UFG/omf,LABORA-UFG/omf,mytestbed/omf,phelipealves/omf,phelipealves/omf,phelipealves/omf