Add a bit more feedback for missing lists

mailman_sync.py

@@ -42,9 +42,11 @@ def main(mailman_bin: Path, api: str, token: str, list_suffix: str):
     ).stdout.split(b"\n")
     certification_lists = r.json()
     for name, members in certification_lists.items():
-        print(name, "\n".join(members))
-        if name + list_suffix in existing_lists:
+        list_name = name + list_suffix
+        if list_name in existing_lists:
             sync_members(mailman_bin, name, members)
+        else:
+            print(f"Skipping {list_name}, as it does not exist in Mailman")
 
 
 if __name__ == "__main__":