Improve error mesages for failed python query() of schedd. #6619
Improve error mesages for failed python query() of schedd. #6619

Specifically, use a CondorError stack and return msg to the user.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor