Fixes : Same Group can be added twice to a playlist #2440

#2440 ,

Now, same group can't be dropped twice on a playlist entry.
Nice, awesome! I learned about the `pluck` statement from you!

You might have a more succinct conditional statement though if you use the [`findWhere`](http://backbonejs.org/#Collection-findWhere) statement. I'm guessing something like `groups_assigned.findWhere({"id": group.get("id")}) != null`.