[12.0.X] do not produce NaNs in SiPixelActionExecutor

[mmusich]

backport of #34900

PR description:

Title says is all, related to issue #34890

PR validation:

Run wf 8.0 with runTheMatrix.py -l 8.0 -j 8 and inspected output DQM ROOT file.

averageDigiOccupancy	avgfedDigiOccvsLumi

if this PR is a backport please specify the original PR and why you need to backport that PR:

backport of #34900

[mmusich]

type bug-fix

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for CMSSW_12_0_X.

It involves the following packages:

• DQM/SiPixelMonitorClient (dqm)
• DQM/SiPixelMonitorDigi (dqm)

@andrius-k, @kmaeshima, @ErnestaP, @ahmad3213, @cmsbuild, @jfernan2, @rvenditti can you please review it and eventually sign? Thanks.
@arossi83, @hdelanno, @sroychow, @fioriNTU, @jandrea, @idebruyn, @threus this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

• Backported from Do not produce NaNs in SiPixelActionExecutor #34900

[tvami]

@cmsbuild , please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-aeb9f6/17865/summary.html
COMMIT: 9fee873
CMSSW: CMSSW_12_0_X_2021-08-18-1100/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/34936/17865/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: 39
• DQMHistoTests: Total histograms compared: 2998564
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2998541
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 38 files compared)
• Checked 165 log files, 37 edm output root files, 39 DQM output files
• TriggerResults: no differences found

[jfernan2]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_0_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1

• Bug fix for 12_0_0