Check if globalrechitsanalyze is in the sequence before modifying it

[mark-grimes]

If validation is configured it deletes globalrechitsanalyze if the pileup is greater than 30. If DQM is also run it tries to modify globalrechitsanalyze and hence throws an exception. This just adds a check to see if globalrechitsanalyze exists before modifying it.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Check if globalrechitsanalyze is in the sequence before modifying it

It involves the following packages:

SLHCUpgradeSimulations/Configuration

@cmsbuild, @civanch, @Degano, @mdhildreth, @nclopezo can you please review it and eventually sign? Thanks.
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@fratnikov, @mark-grimes you are the release manager for this.
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[mark-grimes]

merge

Tested all scenarios with 0 pileup to make sure old behaviour is fine. Tested Shashlik at 140 pileup to make sure the error is fixed.