[12_4_X] RPCDqmClient crash fix for 0 LS runs

[pmandrik]

PR description:

To fix another RPC client crash place in online DQM when 0 LS are in the run ([0]).

[0] https://cmsweb.cern.ch/dqm/dqm-square-k8/api?what=get_logs&id=dqm-source-state-run359813-hostfu-c2f11-11-03-pid038886&db=production

PR validation:

Tested locally, to be tested at P5

[pmandrik]

please test

[cmsbuild]

A new Pull Request was created by @pmandrik (Petr Mandrik) for CMSSW_12_4_X.

It involves the following packages:

• DQM/RPCMonitorClient (dqm)

@emanueleusai, @ahmad3213, @jfernan2, @syuvivida, @pmandrik, @micsucmed, @rvenditti can you please review it and eventually sign? Thanks.
@acimmino 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

[rappoccio]

Backport of #39633. Must be added in 12_6 first.

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-acc514/28026/summary.html
COMMIT: 8da01ad
CMSSW: CMSSW_12_4_X_2022-10-05-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/39630/28026/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: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 3677402
• DQMHistoTests: Total failures: 8
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3677372
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 208 log files, 45 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[emanueleusai]

waiting for tests at p5 to complete

[syuvivida]

waiting for tests at p5 to complete

test at p5 was successful

[emanueleusai]

+1

[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_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