Added an additional channel for downloading the metadata of an entire post or gallery.

gallery_dl/extractor/message.py

@@ -52,3 +52,4 @@ class Message():
     #  Cookies = 5
     Queue = 6
     Urllist = 7
+    Metadata = 8

gallery_dl/extractor/patreon.py

@@ -69,6 +69,10 @@ class PatreonExtractor(Extractor):
                     post["type"] = "content"
                     yield Message.Url, url, text.nameext_from_url(url, post)
 
+            post.update({"metadata_only": True})
+            url = post.get("creator").get("image_url")
+            yield Message.Metadata, url, text.nameext_from_url(url, post)
+
     def posts(self):
         """Return all relevant post objects"""