[Bugfix] fix issue 5065 (#5118)

tests/model_tests/conftest.py

@@ -22,7 +22,7 @@ def tiny_model_paths(request, run_level):
         if not hasattr(item, "callspec"):
             continue
         model_name = item.callspec.params.get("model_name")
-        if model_name is None:
+        if model_name is None or model_name not in DIFFUSION_TEST_SETTINGS:
             continue
         if model_name not in model_paths:
             settings = DIFFUSION_TEST_SETTINGS[model_name]