Add hasattr function for safe if attribute is not existed.

[geonmo]

It is just a fix to avoid missing attribute error.

It was a re-open PR of #11095 due to corruption other commit.

[cmsbuild]

A new Pull Request was created by @geonmo (Geonmo Ryu) for CMSSW_7_6_X.

Add hasattr function for safe if attribute is not existed.

It involves the following packages:

SLHCUpgradeSimulations/Configuration

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@makortel, @Martin-Grunewald this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@Degano you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 6c5dbc3
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11271/8137/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11271/8137/summary.html

[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1