Improve display of errors with no message in script trace (#108735)

homeassistant/helpers/trace.py

@@ -93,7 +93,7 @@ class TraceElement:
         if self._variables:
             result["changed_variables"] = self._variables
         if self._error is not None:
-            result["error"] = str(self._error)
+            result["error"] = str(self._error) or self._error.__class__.__name__
         if self._result is not None:
             result["result"] = self._result
         return result

tests/helpers/test_script.py

@@ -1341,7 +1341,7 @@ async def test_wait_continue_on_timeout(
     }
     if continue_on_timeout is False:
         expected_trace["0"][0]["result"]["timeout"] = True
-        expected_trace["0"][0]["error"] = ""
+        expected_trace["0"][0]["error"] = "TimeoutError"
         expected_script_execution = "aborted"
     else:
         expected_trace["1"] = [{"result": {"event": "test_event", "event_data": {}}}]