Try fix removed nonexistent document error.

Thanks to xet7 !

Related #3203,
related #3252,
related #2230
related #1629

models/cardComments.js

@@ -168,9 +168,6 @@ if (Meteor.isServer) {
       listId: card.listId,
       swimlaneId: card.swimlaneId,
     });
-  });
-
-  CardComments.after.remove((userId, doc) => {
     const activity = Activities.findOne({ commentId: doc._id });
     if (activity) {
       Activities.remove(activity._id);