[12_5_X] [L1T] Backport of : Bug fix on L1TrackJetEmulator

[cecilecaillol]

PR description:

Bug fix on the L1 phase2 trackjet emulation.

Description of the problem: In cases were no tracks are found the code does not return empty containers. It returns nothing with result of failing in later steps or in offline analysis when we try to access them. This is important for samples with PU=0 were the possibility to have events w/o tracks is non-negligible.
Solution: Straightforward just added the empty containers. The change is transparent, just the minimum to prevent the crashes.

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:

Backport of #39479
Backport needed for phase-2 L1 MC production

[cecilecaillol]

backport of #39479

[cmsbuild]

A new Pull Request was created by @cecilecaillol for CMSSW_12_5_X.

It involves the following packages:

• L1Trigger/L1TTrackMatch (upgrade, l1)

@rekovic, @epalencia, @cmsbuild, @AdrianoDee, @srimanob, @cecilecaillol can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @missirol, @beaucero, @trtomei 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 Bug fix on L1TrackJetEmulator #39479

[cecilecaillol]

please test

[cecilecaillol]

type bug-fix

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-33846b/27927/summary.html
COMMIT: a2b349b
CMSSW: CMSSW_12_5_X_2022-10-02-2300/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/39576/27927/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3699454
• DQMHistoTests: Total failures: 2
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3699430
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 50 files compared)
• Checked 212 log files, 49 edm output root files, 51 DQM output files
• TriggerResults: no differences found

[cecilecaillol]

+l1

[AdrianoDee]

+upgrade

• putting an empty collection in the event preventing subsequent failures;
• backport of Bug fix on L1TrackJetEmulator #39479.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_5_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_6_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