Use pydantic model name as default title value

Author: fullonic

instrumentation/opentelemetry-instrumentation-tortoiseorm/src/opentelemetry/instrumentation/tortoiseorm/__init__.py

@@ -300,7 +300,7 @@ async def _from_queryset(self, func, modelcls, args, kwargs):
 
                 model_config = getattr(modelcls, "Config", None)
                 if model_config:
-                    model_title = getattr(modelcls.Config, "title")
+                    model_title = getattr(modelcls.Config, "title", modelcls.__name__)
                     if model_title:
                         span_attributes["pydantic.model"] = model_title