Always show a logo on Login/Create page
Before this change, the logo was only visible, if there is no error
or warning message. That is really confusing and differs from the
behavior of the core login page.
This change changes the logo to appear everytime the login page is
requested, no matter, if there is an error or warning message.
Follow up: I1b09e7ba80d18dc8c19b2aa475c4d269dffc295e