Fixes bug when SoA has not columns, only scalars [13.2.x]

[fwyzard]

PR description:

This PR fixes and issue in macro generation of code when an SoA contains only scalars and not column. Special cases were
introduced to handle this case gracefully.

PR validation:

New SoAs with no columns are added. A successful compilation is enough to validate this PR.

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 #42109 to 13.2.x .

[fwyzard]

backport #42109

[fwyzard]

type bugfix

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for CMSSW_13_2_X.

It involves the following packages:

• DataFormats/SoATemplate (heterogeneous)

@cmsbuild, @makortel, @fwyzard can you please review it and eventually sign? Thanks.
@missirol, @rovere 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 Fixes bug when SoA has not columns, only scalars. #42109

[fwyzard]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-a24479/34113/summary.html
COMMIT: 792466d
CMSSW: CMSSW_13_2_X_2023-08-06-0000/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/42481/34113/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 4 lines to the logs
• Reco comparison results: 10 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3195634
• DQMHistoTests: Total failures: 7
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3195605
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 207 log files, 159 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[fwyzard]

+heterogeneous

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_13_2_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_13_3_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