Merged r18046 from trunk to 4.0-stable (#31120).

git-svn-id: http://svn.redmine.org/redmine/branches/4.0-stable@18047 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/git_adapter.rb

@@ -82,6 +82,7 @@ module Redmine
           git_cmd(cmd_args) do |io|
             io.each_line do |line|
               branch_rev = line.match('\s*(\*?)\s*(.*?)\s*([0-9a-f]{40}).*$')
+              next unless branch_rev
               bran = GitBranch.new(branch_rev[2])
               bran.revision =  branch_rev[3]
               bran.scmid    =  branch_rev[3]