test: Openrouter - make test_live_run_with_tools more robust (#2909)

Author: anakin87

integrations/openrouter/tests/test_openrouter_chat_generator.py

@@ -333,7 +333,7 @@ def test_live_run_with_tools(self, tools):
         results = component.run(chat_messages)
         assert len(results["replies"]) == 1
         message = results["replies"][0]
-        assert message.text == ""
+        assert not message.text
 
         assert message.tool_calls
         tool_call = message.tool_call