Don't set invalid @mr_source_branch when create_merge_request?
Don't set invalid @mr_source_branch when create_merge_request?

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