From Federico: Protect against a negative real value and issue a warning. Fix <http://savannah.cern.ch/bugs/?39919>
From Federico:
Protect against a negative real value and issue a warning.
Fix <http://savannah.cern.ch/bugs/?39919>


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@25110 27541ba8-7e3a-0410-8455-c3a389f83636

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