fix nan Calo-towers, when HO is deactivated, but has energy deposit (and ECAL/HCAL do not have any energy deposits)

[kirschen]

add precaution for deactivated HO (theHOIsUsed==false): set tower energy to tiny value to avoid nan-eta for HO-only towers (when HO is'deactivated', i.e. energy set to zero)
backport of #15568

[cmsbuild]

A new Pull Request was created by @kirschen for CMSSW_8_0_X.

It involves the following packages:

RecoLocalCalo/CaloTowersCreator

@cmsbuild, @cvuosalo, @slava77, @davidlange6 can you please review it and eventually sign? Thanks.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[slava77]

backport of #15568

.. to make the bot add a label

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/14909/console

[cmsbuild]

+1
Tested at: e7b1b37
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15706/14909/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15706/14909/summary.html

[slava77]

+1

for #15706 e7b1b37

• change is as described; the same code change as in 81X fix nan Calo-towers, when HO is deactivated, but has energy deposit (and ECAL/HCAL do not have any energy deposits) #15568
• jenkins tests pass and comparisons with baseline show differences in calo tower plots at zero energy. These differences do not propagate to monitored quantities downstream.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar

[davidlange6]

+1