[comick] fix exception when filtering by 'group' (#8045)

gallery_dl/extractor/comick.py

@@ -207,7 +207,7 @@ class ComickMangaExtractor(ComickBase, MangaExtractor):
                 yield from data["chapters"]
             else:
                 for ch in data["chapters"]:
-                    if group in ch["group_name"]:
+                    if (groups := ch["group_name"]) and group in groups:
                         yield ch
 
             if data["total"] <= limit * page:

test/results/comick.py

@@ -234,4 +234,12 @@ __tests__ = (
     "lang"   : "es-419",
 },
 
+{
+    "#url"     : "https://comick.io/comic/fate-type-redline?lang=en&group=BananaShiki",
+    "#comment" : "'group_name' is None for some chapters (#8045)",
+    "#class"   : comick.ComickMangaExtractor,
+    "#pattern" : comick.ComickChapterExtractor.pattern,
+    "#count"   : range(50, 100),
+},
+
 )