plone/plone.formwidget.querystring — pull request #3 by tmog (2013-01-14 16:44:49+00:00)
Title: Make widget resistant to existing criteria being deleted from the registry

Made the widget a bit more resistent to missing entries, i.e. vocabularies or in other way indexes. The problem occur if an option is deleted from the registry but not deleted from the collections in before hand.