Merge pull request #425 from sartography/some_perf2

Performance improvement when finding tasks in a subworkflow

SpiffWorkflow/bpmn/util/subworkflow.py

@@ -62,7 +62,4 @@ def _calculate_depth(self):
         return depth
 
     def get_task_from_id(self, task_id):
-        try:
-            return super().get_task_from_id(task_id)
-        except TaskNotFoundException as exc:
-            pass
+        return self.tasks.get(task_id)