Auto merge of #4130 - bundler:seg-fix-rake-push, r=segiddins
Auto merge of #4130 - bundler:seg-fix-rake-push, r=segiddins

[GemHelper] Fix crash when pushing gem

\c @indirect

mvz/bundler,asutoshpalai/bundler,RochesterinNYC/bundler,bronzdoc/bundler,bundler/bundler,seanlinsley/bundler,mvz/bundler,dilumnavanjana/bundler,RochesterinNYC/bundler,mpapis/bundler,dilumnavanjana/bundler,asutoshpalai/bundler,mpapis/bundler,bronzdoc/bundler,bundler/bundler,seanlinsley/bundler