fix(eject): guard against empty key before access (#7289)
fix(eject): guard against empty key before access (#7289)

closes #7288
GreenGremlin/create-react-app,jdcrensh/create-react-app,Timer/create-react-app,d3ce1t/create-react-app,GreenGremlin/create-react-app,Timer/create-react-app,facebookincubator/create-react-app,Timer/create-react-app,d3ce1t/create-react-app,jdcrensh/create-react-app,facebookincubator/create-react-app,Timer/create-react-app,facebookincubator/create-react-app,jdcrensh/create-react-app,jdcrensh/create-react-app,GreenGremlin/create-react-app,GreenGremlin/create-react-app,d3ce1t/create-react-app,d3ce1t/create-react-app