Fix crash in ElectronSeedProducer

[mark-grimes]

This fixes the crash in SLHC26 Phase1 2017 workflows reported here:

https://hypernews.cern.ch/HyperNews/CMS/get/relval/3696.html

Tested on 1 of the input sets specified in the tarballs discussed in that email. Logs from 12 of the 14 tarballs have the same error, the other 2 appear to complete successfully.
There are still the various warnings about missing input as pointed out here:

https://hypernews.cern.ch/HyperNews/CMS/get/upgrade-tp-studies/189.html

but the full sample now runs. Those errors are being investigated by experts, they will be fixed in another pull request as required.

@boudoul

[cmsbuild]

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

Fix crash in ElectronSeedProducer

It involves the following packages:

RecoEgamma/EgammaIsolationAlgos

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@Sam-Harper, @lgray this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
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[mark-grimes]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 387f307
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9455/4016/summary.html

[mark-grimes]

merge