Fix hassfest check for schema (#97713)

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

script/hassfest/config_schema.py

@@ -20,7 +20,7 @@ def _has_assignment(module: ast.Module, name: str) -> bool:
             continue
         if type(item) == ast.Assign:
             for target in item.targets:
-                if target.id == name:
+                if getattr(target, "id", None) == name:
                     return True
             continue
         if item.target.id == name: