Clear allow_empty_message_flag when there is an attempt to read data. #2563
Clear allow_empty_message_flag when there is an attempt to read data. #2563

Also, get rid of muddy semantics of allow_empty_message_flag.
Previously, it would both allow a missing message and ignore
trailing junk in a message.

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