Remove Parameter existence check since done by fillDescriptions

[Dr15Jones]

Removed the check on the existence of a given Parameter since the
presence of a fillDescription method automatically guarantees that
the Parameter will exist.
This also fixes a gcc7 compiler warning.

[cmsbuild]

The code-checks are being triggered in jenkins.

[Dr15Jones]

please test

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-22985/4372

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/27531/console Started: 2018/04/17 17:11

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for master.

It involves the following packages:

PhysicsTools/NanoAOD

@gpetruc, @cmsbuild, @arizzi, @monttj can you please review it and eventually sign? Thanks.
@gpetruc this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

+1
Tested at: 937bbf5
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-22985/27531/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-22985/27531/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 29
• DQMHistoTests: Total histograms compared: 2492536
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2492359
• DQMHistoTests: Total skipped: 176
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 23 files compared)
• Checked 119 log files, 9 edm output root files, 29 DQM output files

[fabiocos]

+1

[fabiocos]

merge