Add functionality to clear blacklisted music videos in GroupClearBlacklistView and update group detail template

game/views.py

@@ -246,3 +246,12 @@ class YoutubeCallbackView(LoginRequiredMixin, View):
             },
         )
         return redirect("/")
+
+
+class GroupClearBlacklistView(OwnerFilterMixin, SingleObjectMixin, View):
+    model = models.Group
+
+    def get(self, request, pk):
+        group = self.get_object()
+        group.musicvideo_set.filter(blacklisted=True).update(blacklisted=False)
+        return redirect(group)