fix yet another bug in the analytical integrals over sub-ranges of a RooDataHist
fix yet another bug in the analytical integrals over sub-ranges of a RooDataHist

Signed-off-by: Wouter Verkerke <a828b442a61dc068271c4de5e7263419bac2b4a3@nikhef.nl>

Dr15Jones/root,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,Dr15Jones/root,tc3t/qoot,kirbyherm/root-r-tools,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,kirbyherm/root-r-tools,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,kirbyherm/root-r-tools,Dr15Jones/root