add another check_status option for psate (PBS)

Author: Manyi Yang

dpgen/dispatcher/PBS.py

@@ -16,7 +16,7 @@ def check_status(self) :
             = self.context.block_call ("qstat " + job_id)
         err_str = stderr.read().decode('utf-8')
         if (ret != 0) :
-            if str("qstat: Unknown Job Id") in err_str :
+            if str("qstat: Unknown Job Id") in err_str or str("Job has finished") in err_str:
                 if self.check_finish_tag() :
                     return JobStatus.finished
                 else :