merge from roostats dev branch fix...

merge from roostats dev branch fix http://root.cern.ch/viewvc/branches/dev/roostats/roofit/roostats/src/?view=log from Sven Kreiss


git-svn-id: http://root.cern.ch/svn/root/trunk@37522 27541ba8-7e3a-0410-8455-c3a389f83636