Fix NPEs when handling referenced milestones that do not exist

James Moger

2014-09-04 270e9e762820833d6815e362034dc3f4809b6470

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[submodule "src/main/distrib/data/gitignore"]
    path = src/main/distrib/data/gitignore
    url = https://github.com/github/gitignore.git