Do not call methods on EcalTrigTowerConstituentsMap nullptr

[Dr15Jones]

PR description:

This fixes an UBSAN related error.

PR validation:

Code compiles and workflow 20034.0 does not generate the warning.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-39991/32921

• This PR adds an extra 24KB to repository

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for master.

It involves the following packages:

• Geometry/CaloTopology (geometry)
• SimCalorimetry/EcalEBTrigPrimAlgos (upgrade, l1)
• SimCalorimetry/EcalTrigPrimAlgos (l1)

@civanch, @Dr15Jones, @rekovic, @epalencia, @makortel, @ianna, @mdhildreth, @cmsbuild, @AdrianoDee, @srimanob, @bsunanda, @cecilecaillol can you please review it and eventually sign? Thanks.
@fabiocos, @trtomei, @bsunanda, @rchatter, @valsdav, @rovere, @argiro, @missirol, @thomreis, @simonepigazzini, @sameasy, @beaucero 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

[Dr15Jones]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9229d4/28796/summary.html
COMMIT: a7c0e6a
CMSSW: CMSSW_12_6_X_2022-11-04-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/39991/28796/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: 12 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3416402
• DQMHistoTests: Total failures: 9
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3416371
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 206 log files, 48 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[cecilecaillol]

+l1

[civanch]

+1

this is pure technical fix.

[AdrianoDee]

+upgrade

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). 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)

[rappoccio]

+1

technical PR