Open search form when reaching a search page through direct URL

When reaching a search page through direct URL, the search form should be opened.

How to reproduce:

• in the browser's address bar enter http://localhost:8080/nuxeo/ui/#!/search/default

The default search is executed with empty predicates. The user has to click on the search's button in the side bar in order to open the search form. It is even more annoying the the search does not execute automatically.