fix Merge with labels when one of the histogram is empty (see http://root.cern.ch/phpBB3//viewtopic.php?f=3&t=11963 )
fix Merge with labels when one of the histogram is empty
(see http://root.cern.ch/phpBB3//viewtopic.php?f=3&t=11963 )


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@38794 27541ba8-7e3a-0410-8455-c3a389f83636

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