make sure open PR dropdown shows in forks
    
    This makes sure that the open PR dropdown in the repomaster
    always is shown, even if PRs for the fork itself are closed.
    
    A user may not have PRs open for the fork itself, but still wany
    to open a PR agaisnt the upstream.
    
    Signed-off-by: Ryan Lerch <rlerch@redhat.com>