The clear filter button in the content chooser doesn't work

[wesleybl]

When we have filtered contents, and we click on the "X" button to clear the filter, the contents tree continues listing the items of the previous filter, the amount of items found:

In Javascript console we see the error:

cover-8201835.js:1
Uncaught ReferenceError: portal_url is not defined
    at HTMLAnchorElement.<anonymous> (cover-8201835.js:1:14550)
    at HTMLDocument.dispatch (jquery.min.js:3:12444)
    at p.dispatch (plone-logged-in-compiled.js:8311:19)
    at r.handle (jquery.min.js:3:9173)