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 this warning.
Merge pull request #2871 from Dr15Jones/ignoreNbinsyWarningFromROOT_threaded

Misc cleanups -- Ignore new nbinsy warning from ROOT