Do not display fork button if target repo already exists (fixes #944)

James Moger

2015-11-10 c332d9a3d4d9485cfe60fb8dd9db7dbde971642c

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