don't write "Empty" in a histogram in case option "SAME" is used.
don't write "Empty" in a histogram in case option "SAME" is used.

In case a select results in 0 events this would delete all previous
drawn contents, even if option "SAME" is used.

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot