Added exception if all caches are empty in PluginManager

[Dr15Jones]

PR description:

This was prompted by failures in the IB.

PR validation:

Framework unit tests pass.

[Dr15Jones]

please test

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-44823/40067

• This PR adds an extra 20KB to repository

[cmsbuild]

A new Pull Request was created by @Dr15Jones for master.

It involves the following packages:

• FWCore/PluginManager (core)

@Dr15Jones, @smuzaffar, @makortel can you please review it and eventually sign? Thanks.
@wddgit, @makortel, @missirol this is something you requested to watch as well.
@antoniovilela, @sextonkennedy, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5f83ac/39039/summary.html
COMMIT: 494e823
CMSSW: CMSSW_14_1_X_2024-04-23-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/44823/39039/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @Raffaella07 Adding Phase2 tracker T36, T37 and T38 (for IT studies) #44765
• @mmusich BrokenLineFit and RiemannFit: mask asserts behind DEBUG flags #44801
• @fwyzard Migrate assert to to ALPAKA_ASSERT_ACC #44802

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5f83ac/39039/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5f83ac/39039/git-merge-result

Comparison Summary

There are some workflows for which there are errors in the baseline:
25088.203 step 3
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

Summary:

• You potentially added 4 lines to the logs
• Reco comparison results: 47 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3319852
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3319826
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 202 log files, 165 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[makortel]

Comparisons show the usual

• Non reproducibility in wf 136.793 #43293
• Non-reproducibility in TriggerResults in 24834.0, 24834.911, and 25034.999 #43790

[makortel]

+core

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

[antoniovilela]

+1