📝 Fix type alias check to ensure check_type is not empty before validation

Author: stickm4n

sqlmodel/_compat.py

@@ -207,7 +207,7 @@ def _is_typing_type_instance(annotation: Any, type_name: str) -> bool:
         if hasattr(typing_extensions, type_name):
             check_type.append(getattr(typing_extensions, type_name))
 
-        return check_type and isinstance(annotation, tuple(check_type))
+        return bool(check_type) and isinstance(annotation, tuple(check_type))
 
     def _is_new_type_instance(annotation: Any) -> bool:
         return _is_typing_type_instance(annotation, "NewType")