SiPixelLorentzAnglePCLHarvester: protect the computation of the LA error in case of missing covariance matrix

[mmusich]

PR description:

Title says it all, resolves the issue reported at #38996 (comment)

PR validation:

Run successfully with this branch:

runTheMatrix.py -l 1001.2 -j 8 -t 4

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:

Not a backport, but will be included in the backport of #38996 (#39075)

[mmusich]

type trk, bug-fix

[mmusich]

test parameters:

• workflows = 1001.2

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-39083/31589

• This PR adds an extra 20KB to repository

[cmsbuild]

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

It involves the following packages:

• CalibTracker/SiPixelLorentzAngle (alca)

@malbouis, @yuanchao, @cmsbuild, @saumyaphor4252, @francescobrivio, @ChrisMisan, @tvami can you please review it and eventually sign? Thanks.
@tocheng, @OzAmram, @ferencek, @mmusich, @dkotlins, @tvami this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[tvami]

urgent

• the backport should go into the next 12_4_X

[tvami]

@cmsbuild , please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-dc5976/26859/summary.html
COMMIT: 79915eb
CMSSW: CMSSW_12_5_X_2022-08-16-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/39083/26859/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

There are some workflows for which there are errors in the baseline:
1001.2 step 5
The results for the comparisons for these workflows could be incomplete
This means most likely that the IB is having errors in the relvals.The error does NOT come from this pull request

@slava77 comparisons for the following workflows were not done due to missing matrix map:

• /data/cmsbld/jenkins/workspace/compare-root-files-short-matrix/data/PR-dc5976/1001.2_RunZeroBias2017F+RunZeroBias2017F+TIER0EXPRUN2+ALCAEXPRUN2+ALCAHARVDSIPIXELCAL+ALCAHARVDSIPIXELCALLA+ALCAHARVD4+ALCAHARVDSIPIXELALIHG

Summary:

• No significant changes to the logs found
• Reco comparison results: 8 differences found in the comparisons
• DQMHistoTests: Total files compared: 52
• DQMHistoTests: Total histograms compared: 3692500
• DQMHistoTests: Total failures: 13
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3692464
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 23.413999999999998 KiB( 51 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• DQMHistoSizes: changed ( 1001.2 ): 23.447 KiB AlCaReco/SiPixelAliHG
• DQMHistoSizes: changed ( 1001.2 ): -0.424 KiB PixelPhase1/EventInfo
• DQMHistoSizes: changed ( 1001.2 ): 0.395 KiB AlCaReco/EventInfo
• Checked 217 log files, 49 edm output root files, 52 DQM output files
• TriggerResults: no differences found

[tvami]

+alca

[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, @qliphy, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[qliphy]

+1