In Scheduler::add_shadow_rec(), sin_to_hostname() might return a NULL.  If so, instead of seg faulting, we should just put the sinful string into the RemoteHost attribute.
In Scheduler::add_shadow_rec(), sin_to_hostname() might return a
NULL.  If so, instead of seg faulting, we should just put the sinful
string into the RemoteHost attribute.

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