Set languages to 'all' when no project is supplied

article_quality/app.py

@@ -68,7 +68,8 @@ def _generate_data(spark, mediawiki_snapshot, wikidata_snapshot,
         wikitext_table = 'wmf.mediawiki_wikitext_history'
         item_page_link_table = 'wmf.wikidata_item_page_link'
 
-    languages = '_'.join([x.rstrip('wiki') for x in projects])
+    languages = '_'.join([x.rstrip('wiki') for x in projects]) \
+        if projects else 'all'
     features_table = f'{start_date.strftime("%Y%m%d")}_{end_date.strftime("%Y%m%d")}_{languages}_features'
     features_file = f'{save_directory}/{features_table}.parquet' if save_directory else None
     scores_table = f'{start_date.strftime("%Y%m%d")}_{end_date.strftime("%Y%m%d")}_{languages}_scores'