Toshi MARUYAMA 36bce52f63 Merged r6246 from trunk.
scm: mercurial: do nothing in fetching if info is nil.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/1.2-stable@6254 e93f8b46-1217-0410-a6f0-8f06a7374b81
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