Only populate reviewers on create

opentech/apply/funds/models.py

@@ -625,6 +625,7 @@ class ApplicationSubmission(WorkflowHelpers, BaseStreamForm, AbstractFormSubmiss
                 self.form_data[field.id] = self.handle_files(file)
 
         creating = not self.id
+
         if creating:
             # We are creating the object default to first stage
             self.workflow_name = self.get_from_parent('workflow_name')