fix tests

Author: maximearmstrong

python_modules/libraries/dagster-dbt/dagster_dbt_tests/cloud_v2/test_asset_decorator.py

@@ -196,14 +196,13 @@ def test_selections(
     expected_dbt_resource_names: set[str],
 ) -> None:
     select = select or "fqn:*"
-    exclude = exclude or ""
 
     expected_asset_keys = {AssetKey(key) for key in expected_dbt_resource_names}
     expected_specs, _ = build_dbt_specs(
         manifest=get_sample_manifest_json(),
         translator=DagsterDbtTranslator(),
         select=select,
-        exclude=exclude,
+        exclude=exclude or "",
         io_manager_key=None,
         project=None,
     )