guard against no L1T uGT digis in L1TriggerResultsConverter [12_4_X]

[missirol]

backport of #40528

PR description:

This PR fixes the edge case reported in #40494. It adds a check on the size of the L1T uGT digis, returning false for all L1T algorithms when said input collection has 0 elements for the relevant BX (see #40528 (comment) for details).

PR validation:

None beyond the checks done for #40528.

If this PR is a backport, please specify the original PR and why you need to backport that PR. If this PR will be backported, please specify to which release cycle the backport is meant for:

#40528

Bugfix to NanoAOD.

[cmsbuild]

A new Pull Request was created by @missirol (Marino Missiroli) for CMSSW_12_4_X.

It involves the following packages:

• PhysicsTools/NanoAOD (xpog)

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

cms-bot commands are listed here

• Backported from guard against no L1T uGT digis in L1TriggerResultsConverter #40528

[missirol]

type bugfix

[missirol]

enable nano

[missirol]

please test

[missirol]

please abort

Looks like "enable nano" is not an option in 12_4_X.

[missirol]

please test

[missirol]

please abort

I should 'disable nano'..

[missirol]

enable none

[missirol]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ce2e3f/30305/summary.html
COMMIT: 16a45bc
CMSSW: CMSSW_12_4_X_2023-01-29-0000/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/40651/30305/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 2113 lines from the logs
• Reco comparison results: 9 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3766083
• DQMHistoTests: Total failures: 7
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3766053
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 50 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 212 log files, 167 edm output root files, 51 DQM output files
• TriggerResults: no differences found

[swertz]

+1

verbatim backport.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_4_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_13_0_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1