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

James Moger

2015-11-10 c332d9a3d4d9485cfe60fb8dd9db7dbde971642c

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dn: CN=Git_Group_Without_Members,OU=Groups,OU=UserControl,OU=MyOrganization,DC=MyDomain
objectClass: top
objectClass: group
cn: Git_Group_Without_Members
sAMAccountName: Git_Group_Without_Members