Prefer unless over if not
Prefer unless over if not

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/builds/7606797

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