When removing nupickers property editor from a Document Type doesn't delete created relations

[Alain-es]

Hi!

Today we have started to use nuPickers ... and the first thing we want to say you is THANK YOU for these incredible property editors!!

We have added a nuPicker property editor to a Content Type using the relation mapping feature. Everything seems to work properly. The problem is when you decide to remove this property from the content type, the relations created are still here! Is that normal? Umbraco v7.1.4 and nuPickers v 1.2.1

Cheers, Alain