yield 3-tuples for Message.Directory

adapt tuples to the same length and semantics as other messages

gallery_dl/extractor/urlgalleries.py

@@ -38,7 +38,7 @@ class UrlgalleriesGalleryExtractor(GalleryExtractor):
         data["count"] = len(imgs)
 
         root = self.root
-        yield Message.Directory, data
+        yield Message.Directory, "", data
         for data["num"], img in enumerate(imgs, 1):
             page = self.request(root + img).text
             url = text.extr(page, "window.location.href = '", "'")