Make sure merge request is fetched before collecting base sha in merge request diff
Make sure merge request is fetched before collecting base sha in merge request diff

Signed-off-by: Dmitriy Zaporozhets <be23d75b156792e5acab51b196a2deb155d35d6a@gmail.com>

dplarson/gitlabhq,stoplightio/gitlabhq,daiyu/gitlab-zh,openwide-java/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mr-dxdy/gitlabhq,SVArago/gitlabhq,shinexiao/gitlabhq,SVArago/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,daiyu/gitlab-zh,darkrasid/gitlabhq,SVArago/gitlabhq,allysonbarros/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,iiet/iiet-git,darkrasid/gitlabhq,darkrasid/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,allysonbarros/gitlabhq,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,shinexiao/gitlabhq,shinexiao/gitlabhq,htve/GitlabForChinese,openwide-java/gitlabhq,screenpages/gitlabhq,iiet/iiet-git,SVArago/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,mr-dxdy/gitlabhq,screenpages/gitlabhq,icedwater/gitlabhq,screenpages/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,LUMC/gitlabhq,jirutka/gitlabhq,icedwater/gitlabhq,openwide-java/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,LUMC/gitlabhq,daiyu/gitlab-zh,shinexiao/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,icedwater/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,daiyu/gitlab-zh,allysonbarros/gitlabhq,allysonbarros/gitlabhq,icedwater/gitlabhq,screenpages/gitlabhq,axilleas/gitlabhq,LUMC/gitlabhq