connector_search_engine: store to_be_checked error

Before this change the error was visible only in the job
if not deleted.
This we can provide more info to the end user
w/o the need for a new field.
This info will be wiped on the next successful compute.

connector_search_engine/models/se_binding.py

@@ -203,6 +203,7 @@ def _recompute_json(self, force_export=False):
                         vals["date_modified"] = fields.Datetime.now()
                     if error:
                         vals["sync_state"] = "to_be_checked"
+                        vals["data"]["__error__"] = error
                     binding.write(vals)
         if validation_errors:
             result.append(

connector_search_engine/tests/test_all.py

@@ -383,6 +383,9 @@ def test_recompute_json_to_be_checked(self):
             "Validation errors:\n\n  "
             f"Something wrong with data - IDs: {self.partner_binding.id}",
         )
+        self.assertEqual(
+            self.partner_binding.data["__error__"], "Something wrong with data"
+        )
 
     def test_recompute_json_to_be_checked_rollback(self):
         # If something was to check but it's now good,