Fix GitLab project import when a user has access only to their default namespace.
Fix GitLab project import when a user has access only to their default namespace.

Render a hidden field with namespace ID so it can be read by JavaScript
and passed to "/import/gitlab_project/new" screen.

axilleas/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,htve/GitlabForChinese,htve/GitlabForChinese,dplarson/gitlabhq,dreampet/gitlab,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,jirutka/gitlabhq,LUMC/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,iiet/iiet-git,LUMC/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab