eigen: Don't crash on empty tensor contraction

[smuzaffar]

See cms-externals/eigen-git-mirror#8

[smuzaffar]

please test

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_14_1_X/master.

@iarspider, @smuzaffar, @aandvalenzuela can you please review it and eventually sign? Thanks.
@rappoccio, @antoniovilela, @sextonkennedy you are the release manager for this.
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[cmsbuild]

cms-bot internal usage

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d7ba46/37485/summary.html
COMMIT: e72103c
CMSSW: CMSSW_14_1_X_2024-02-14-2300/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/9021/37485/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:

• @cms-sw grpcio: Changes backported from TF 2.15 branch #9015

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d7ba46/37485/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d7ba46/37485/git-merge-result

Comparison Summary

Summary:

• You potentially removed 108 lines from the logs
• Reco comparison results: 47 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3248554
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3248526
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 200 log files, 161 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_14_1_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @rappoccio, @sextonkennedy, @antoniovilela (and backports should be raised in the release meeting by the corresponding L2)

[smuzaffar]

14.1.0.0pre0 has been built , so lets get this in for next IB