Allow empty lists of instances.
Allow empty lists of instances.

When doing a DCLOUD_VM_STATUS_ALL, if the GAHP succeeded,
but returned 0 results, the gridmanager would consider it
a failure.  Consider this case a success.

clalancette/condor-dcloud,neurodebian/htcondor,bbockelm/condor-network-accounting,zhangzhehust/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,clalancette/condor-dcloud,clalancette/condor-dcloud,mambelli/osg-bosco-marco,clalancette/condor-dcloud,djw8605/condor,zhangzhehust/htcondor,mambelli/osg-bosco-marco,htcondor/htcondor,neurodebian/htcondor,djw8605/condor,mambelli/osg-bosco-marco,zhangzhehust/htcondor,mambelli/osg-bosco-marco,djw8605/htcondor,djw8605/condor,htcondor/htcondor,djw8605/condor,htcondor/htcondor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,zhangzhehust/htcondor,neurodebian/htcondor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,mambelli/osg-bosco-marco,clalancette/condor-dcloud,djw8605/htcondor,htcondor/htcondor,djw8605/condor,djw8605/htcondor,djw8605/htcondor,bbockelm/condor-network-accounting,djw8605/condor,neurodebian/htcondor,bbockelm/condor-network-accounting,clalancette/condor-dcloud,htcondor/htcondor,bbockelm/condor-network-accounting,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,djw8605/condor,djw8605/htcondor,djw8605/htcondor,djw8605/htcondor,bbockelm/condor-network-accounting,zhangzhehust/htcondor,djw8605/htcondor,clalancette/condor-dcloud,zhangzhehust/htcondor,djw8605/condor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco