Fix error msg and use list()

Author: Kevin Kim

tests/integration/test_data_row_media_attributes.py

@@ -5,8 +5,8 @@ def test_export_empty_media_attributes(configured_project_with_label):
     project, _, _, _ = configured_project_with_label
     # Wait for exporter to retrieve latest labels
     sleep(10)
-    labels = project.label_generator().as_list()
+    labels = list(project.label_generator())
     assert len(
         labels
-    ) == 1, "Labels could not be fetched via `project.label_generator()`"
+    ) == 1, "Label export job unexpectedly returned an empty result set`"
     assert labels[0].data.media_attributes == {}