feeds/update.py: fix sources which have null description

pkgs/additional/feeds/update.py

@@ -36,7 +36,7 @@ def clean_item(item: dict) -> dict:
             "url",          # used by <hosts/common/feeds.nix> (and many others)
             "velocity",     # used by <hosts/common/feeds.nix>
             # "version",
-        ]
+        ] and item[k] is not None
     }
     # clean up characters for better printability
     for k in "title", "site_name", "description":
@@ -89,13 +89,13 @@ def main():
     serialized = [item.serialize() for item in items]
     serialized = [clean_item(s) for s in serialized]
     for item in serialized:
-            print(json.dumps(item, sort_keys=True, indent=2))
+        print(json.dumps(item, sort_keys=True, indent=2))
 
     # save the best feed to disk
     keep = select_feed(serialized, prefer_podcast=prefer_podcast)
     results = json.dumps(keep, sort_keys=True, indent=2)
     with open(json_path, "w") as out:
-            out.write(results)
+        out.write(results)
 
 if __name__ == '__main__':
     main()