Allowing empty user text in tag log entries

[ggovi]

This fix is required by the Oracle storage, where empty strings are treated as NULL. Empty string from the user text will be converted into "-".

Only affecting direct wrinting into Oracle => O2Os

[cmsbuild]

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

It involves the following packages:

CondCore/CondDB

@ggovi, @cmsbuild, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @apfeiffer1 this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[ggovi]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/11959/console

[cmsbuild]

+1
Tested at: 207e311
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13771/11959/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
bd2081e
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13771/11959/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13771/11959/git-merge-result

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13771/11959/summary.html

[ggovi]

+1

[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, @Degano, @smuzaffar