Fix of HLTDeDxFilter for 73X

[Martin-Grunewald]

Fix of HLTDeDxFilter for 73X
Do not get the collection if it is not used.

[cmsbuild]

A new Pull Request was created by @Martin-Grunewald (Martin Grunewald) for CMSSW_7_3_X.

Fix of HLTDeDxFilter for 73X

It involves the following packages:

RecoTracker/DeDx

@cmsbuild, @nclopezo, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @rovere, @VinInn, @appeltel, @gpetruc, @cerati, @dgulhan, @venturia this is something you requested to watch as well.
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@nclopezo, @ktf you are the release manager for this.
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[StoyanStoynev]

@cmsbuild please test

[StoyanStoynev]

Identical to #6287 - see there to see what's holding it.

[StoyanStoynev]

@cmsbuild please test

[Martin-Grunewald]

@nclopezo can you please check why tests are not run on this PR?

[cmsbuild]

+1
Tested at: 334d77a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6288/762/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6288/762/summary.html

[StoyanStoynev]

+1
For 334d77a .
Based on jenkins and tests in #6287 (which is identical PR but for 72X) - no diffs and none expected.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_3_X IBs unless changes (tests are also fine). This pull request will be automatically merged.