Remove last facet fails

Problem/Motivation

After making facets use Facets Pretty Paths everything is beautiful and works perfectly, except that when we try to remove the last facet, it reloads with that facet still selected.

(The clear button is also not working in the same way, but we may have customized that and it would be an easy fix anyway.)

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes