Ignore new nbinsy warning from ROOT

ROOT 5.34.17 has added additional warnings which we convert to exceptions. The warning about nbinsy <=0 is irrelevant since ROOT has a reasonable behavior in this case. Therefore, we want to ignore it.
Merge pull request #2870 from Dr15Jones/ignoreNbinsyWarningFromROOT

ROOT 5.34.17 -- Ignore new nbinsy warning from ROOT