Safari 9.0 does not yet honor the HTML5 `origin-when-cross-origin` mode,
and it's possible load balancers/proxies strip the HTTP_REFERER from
the request header. In these cases, default to some default path.
Closes#3122
Closes https://github.com/gitlabhq/gitlabhq/issues/9731
Importing a JSON file with only one Subversion project lead to confusion
over whether the system was working. Provide status why these projects
could not be imported directly.
Closes#1531