[FIX] report_substitute: handle reports without xml_id

The change replaces self._for_xml_id(action_report.xml_id) with action_report.read()[0] to avoid errors when reports do not have an xml_id, such as when they are created via the interface.

report_substitute/models/ir_actions_report.py

@@ -45,7 +45,7 @@ def get_substitution_report_action(self, action, active_ids):
                 substitution_report = action_report._get_substitution_report(
                     action_report.model, active_ids
                 )
-            action.update(self._for_xml_id(action_report.xml_id))
+            action.update(action_report.read()[0])
 
         return action