Don't show the Todo count if there aren't any Todos.
Don't show the Todo count if there aren't any Todos.

When there are 0 Todos, the Todos icon still had the blue badge with a "0" in it, which made me think I had a new Todo left. This makes it less annoying.

Follow-up on !4077.

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