Click new issue from issue page after sorting makes a ridiculous URL

1. Sort on issues page.
2. Click new issue.

ER: The url should be https://gitlab.com/gitlab-org/gitlab-ce/issues/new.

AR: The url is https://gitlab.com/gitlab-org/gitlab-ce/issues/new?issue%5Bassignee_id%5D=&issue%5Bmilestone_id%5D=

Should be a quick fix. I think this can be solved on the frontend.

cc @DouweM @iamphill @alfredo1 @annabeldunstone @elvongray