Maxime Gasselin authored Dec 03, 2018 and Romain Bignon committed Dec 06, 2018

Here we raise a BrowserUnavailable when this page is not correctly
reached. Indeed, this error case seems to occur randomly (a
connection push restores the connection).

Closes: 29243@sibi 29222@sibi 8399@zendesk 8398@zendesk