Fixing broken document migration

* adds changes to document migration to correctly migrate documents

intervention/models/intervention.py

@@ -145,7 +145,8 @@ class Intervention(BaseObject,
         Returns:
 
         """
-        celery_export_to_egon.delay(self.id)
+        if self.payments.exists():
+            celery_export_to_egon.delay(self.id)
 
     def set_recorded(self, user: User) -> UserActionLogEntry:
         log_entry = super().set_recorded(user)