[kemonoparty] fix 'comments' for posts without comments (#6415)

https://github.com/mikf/gallery-dl/issues/6415#issuecomment-2501966303

gallery_dl/extractor/kemonoparty.py

@@ -90,12 +90,19 @@ class KemonopartyExtractor(Extractor):
                 post["username"] = username
                 post["user_profile"] = profile
             if comments:
-                post["comments"] = self.api.creator_post_comments(
-                    service, creator_id, post["id"])
+                try:
+                    post["comments"] = self.api.creator_post_comments(
+                        service, creator_id, post["id"])
+                except exception.HttpError:
+                    post["comments"] = ()
             if dms is not None:
                 if dms is True:
                     dms = self.api.creator_dms(
                         post["service"], post["user"])
+                    try:
+                        dms = dms["props"]["dms"]
+                    except Exception:
+                        dms = ()
                 post["dms"] = dms
             if announcements is not None:
                 if announcements is True:

test/results/kemonoparty.py

@@ -123,12 +123,23 @@ __tests__ = (
 },
 
 {
-    "#url"     : "https://kemono.su/patreon/user/34134344/post/38129255",
-    "#comment" : "DMs (#2008)",
+    "#url"     : "https://kemono.su/patreon/user/3161935/post/23445732",
+    "#comment" : "comments (#2008)",
     "#category": ("", "kemonoparty", "patreon"),
     "#class"   : kemonoparty.KemonopartyPostExtractor,
-    "#options" : {"dms": True},
+    "#options" : {"comments": True},
 
+    "comments": "len:12",
+},
+
+{
+    "#url"     : "https://kemono.su/patreon/user/34134344/post/38129255",
+    "#comment" : "DMs (#2008); no comments",
+    "#category": ("", "kemonoparty", "patreon"),
+    "#class"   : kemonoparty.KemonopartyPostExtractor,
+    "#options" : {"dms": True, "comments": True},
+
+    "comments": (),
     "dms": [
         {
             "added"    : "2021-07-31T02:47:51.327865",