Handle case where operation history was not already defined before

building_dao/building_generic.py

@@ -68,12 +68,19 @@ class BuildingGeneric:
 
     def update_status_history(self, status: str) -> None:
         """
-        update the history
+        Update the history.
         Note: the retries for conflict error are managed within BKC API
         """
+
+        if self._building.get("operation_history") is None:
+            operation_history = [status]  # Init the history if did not already exist
+        else:
+            operation_history = [*self._building.get("operation_history"), status]
+
         payload = {
-            "operation_history": [*self._building.get("operation_history"), status]
+            "operation_history": operation_history
         }
+
         self._req("put", join(self.settings.base_url, self._uid), json={**payload})
 
     def register_error_for_building(self, error_code: str):