Shashlyk bug fix 3

[fratnikov]

Fix problem causing crash in Shervin's tests

[cmsbuild]

A new Pull Request was created by @fratnikov (Fedor Ratnikov) for CMSSW_6_2_X_SLHC.

Shashlyk bug fix 3

It involves the following packages:

SimG4CMS/Calo

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

@mark-grimes @andersonjacob Possible to merge this soon so it can be in the afternoon IB?

[mark-grimes]

merge

Sorry @lgray, missed the IB but it's only one .cc file so doesn't introduce huge dependencies.
Tested with #3960, see the notes there.