handle zero-events nanoAOD files [13.0.X]

[namapane]

PR description:

Plain backport of #43533.

[cmsbuild]

A new Pull Request was created by @namapane (Nicola Amapane) for CMSSW_13_0_X.

It involves the following packages:

• PhysicsTools/NanoAOD (xpog)

@cmsbuild, @vlimant, @simonepigazzini can you please review it and eventually sign? Thanks.
@gpetruc, @AnnikaStein this is something you requested to watch as well.
@sextonkennedy, @rappoccio, @antoniovilela you are the release manager for this.

cms-bot commands are listed here

[vlimant]

enable nano

[vlimant]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3805d0/36858/summary.html
COMMIT: 31bbfd0
CMSSW: CMSSW_13_0_X_2024-01-14-0000/el8_amd64_gcc11
Additional Tests: NANO
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/43536/36858/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 220 lines from the logs
• Reco comparison results: 22 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3283620
• DQMHistoTests: Total failures: 996
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3282602
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 213 log files, 164 edm output root files, 49 DQM output files
• TriggerResults: no differences found

NANO Comparison Summary

Summary:

• You potentially added 1 lines to the logs
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 12
• DQMHistoTests: Total histograms compared: 12520
• DQMHistoTests: Total failures: 0
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 12520
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 11 files compared)
• Checked 25 log files, 11 edm output root files, 12 DQM output files

Nano size comparison Summary:

Sample	kb/ev	ref kb/ev	diff kb/ev	ev/s/thd	ref ev/s/thd	diff rate	mem/thd	ref mem/thd
2500.31	2.469	2.469	0.000 ( +0.0% )	5.38	5.39	-0.2%	2.089	2.090
2500.311	2.610	2.610	0.000 ( +0.0% )	4.86	4.84	+0.5%	2.518	2.514
2500.312	2.522	2.522	0.000 ( +0.0% )	5.02	4.97	+1.2%	2.499	2.500
2500.33	1.264	1.264	0.000 ( +0.0% )	10.25	10.28	-0.3%	2.212	2.210
2500.331	1.634	1.634	0.000 ( +0.0% )	5.46	5.45	+0.2%	2.403	2.395
2500.332	1.516	1.516	0.000 ( +0.0% )	7.87	7.86	+0.1%	2.311	2.311
2500.401	2.126	2.126	0.000 ( +0.0% )	5.45	5.43	+0.5%	1.951	1.950
2500.501	1.731	1.731	0.000 ( +0.0% )	9.33	9.35	-0.2%	1.833	1.830
2500.511	1.125	1.125	0.000 ( +0.0% )	4.51	4.46	+1.2%	2.193	2.153
2500.5111	1.479	1.479	0.000 ( +0.0% )	3.99	3.97	+0.4%	2.231	2.231
2500.601	1.991	1.991	0.000 ( +0.0% )	13.11	13.09	+0.1%	1.878	1.874

[vlimant]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_13_0_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_14_0_X is complete. This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @rappoccio, @antoniovilela (and backports should be raised in the release meeting by the corresponding L2)

[rappoccio]

+1