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

app/models/repository/mercurial.rb

@@ -123,6 +123,7 @@ def latest_changesets_cond(path, rev, limit)
   private :latest_changesets_cond
 
   def fetch_changesets
+    return if scm.info.nil?
     scm_rev = scm.info.lastrev.revision.to_i
     db_rev = latest_changeset ? latest_changeset.revision.to_i : -1
     return unless db_rev < scm_rev  # already up-to-date