[8muses] skip albums without valid 'permalink' (#6717)

gallery_dl/extractor/8muses.py

@@ -57,7 +57,12 @@ class _8musesAlbumExtractor(Extractor):
             albums = data.get("albums")
             if albums:
                 for album in albums:
-                    url = self.root + "/comics/album/" + album["permalink"]
+                    permalink = album.get("permalink")
+                    if not permalink:
+                        self.log.debug("Private album")
+                        continue
+
+                    url = self.root + "/comics/album/" + permalink
                     yield Message.Queue, url, {
                         "url"       : url,
                         "name"      : album["name"],

test/results/8muses.py

@@ -69,4 +69,12 @@ __tests__ = (
     "#exception": exception.HttpError,
 },
 
+{
+    "#url"     : "https://comics.8muses.com/comics/album/Tufos-Comics/Gallery",
+    "#comment" : "private albums without 'permalink' (#6717)",
+    "#category": ("", "8muses", "album"),
+    "#class"   : _8muses._8musesAlbumExtractor,
+    "#count"   : range(100, 150),
+},
+
 )