yield 3-tuples for Message.Directory

adapt tuples to the same length and semantics as other messages

gallery_dl/extractor/catbox.py

@@ -52,5 +52,5 @@ class CatboxFileExtractor(Extractor):
     def items(self):
         url = text.ensure_http_scheme(self.url)
         file = text.nameext_from_url(url, {"url": url})
-        yield Message.Directory, file
+        yield Message.Directory, "", file
         yield Message.Url, url, file