write_submit_script should return nothing

parsl/providers/cluster_provider.py

@@ -91,7 +91,7 @@ def _write_submit_script(self, template, script_filename, job_name, configs):
               - configs (dict) : configs that get pushed into the template
 
         Returns:
-              - True: on success
+              - None
 
         Raises:
               SchedulerMissingArgs : If template is missing args
@@ -117,7 +117,7 @@ def _write_submit_script(self, template, script_filename, job_name, configs):
             logger.error("Uncategorized error: %s", e)
             raise e
 
-        return True
+        return
 
     @abstractmethod
     def _status(self):