Fix QuickTrackAssociatorByHits for empty TrackingParticleRefVector #13570
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This PR fixes a bug introduced in #13348: empty TrackingParticleRefVector has ProductID 0:0 and thus failes a check against the ProductID for mapped objects in ClusterTPAssociation.
Tested in CMSSW_8_1_X_2016-03-02-2300, the workflows 11.0,1311.0,1323.0 that are failing in the IB should get fixed.