Merge pull request #344 from ExaWorks/check_state_before_cancelling

Check if the job is in a final state before attempting to ask the exe…

Author: hategan

src/psij/job.py

@@ -154,6 +154,8 @@ def cancel(self) -> None:
 
         :raises psij.SubmitException: if the job has not yet been submitted.
         """
+        if self.status.final:
+            return
         if not self.executor:
             raise SubmitException('Cannot cancel job: not bound to an executor.')
         else: