Prevent dumpdata from dumping api_admin's Catalog model

The Catalog model is unmanaged, meaning no corresponding table exists in the database. When dumpdata tries to dump this model, it chokes because there's no table to read from.

scripts/reset-test-db.sh

@@ -92,8 +92,8 @@ else
 
         # Dump the schema and data to the cache
         echo "Using the dumpdata command to save the $db fixture data to the filesystem."
-        ./manage.py lms --settings bok_choy dumpdata --database $db > $DB_CACHE_DIR/bok_choy_data_$db.json
-        echo "Saving the schema of the $dh bok_choy DB to the filesystem."
+        ./manage.py lms --settings bok_choy dumpdata --database $db > $DB_CACHE_DIR/bok_choy_data_$db.json --exclude=api_admin.Catalog
+        echo "Saving the schema of the $db bok_choy DB to the filesystem."
         mysqldump -u root --no-data --skip-comments --skip-dump-date "${databases[$db]}" > $DB_CACHE_DIR/bok_choy_schema_$db.sql
 
         # dump_data does not dump the django_migrations table so we do it separately.