Search constraints with a "/" results into an error

[Murksther]

In our specific case when using the multi-select dropdown and an option is selected that contains a "/" an error is thrown.

The error seems to be caused in the Core.js line 295 where the split action now splits on "/" instead of listenerWidget.listenpath. When I locally change this and also remove the "/" from the newLowerOptionFilter (line 298) the problem seems to be fixed for us.