Better exception message and some additional code comment
Better exception message and some additional code comment

dplarson/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,dreampet/gitlab,iiet/iiet-git,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab