Opening two simultaneous HiForest instances

[velicanu]

Currently if you try to type the following 3 lines in ROOT you'll get a segfault. This also happens if you try to use a macro (compiled) where it tries to have two hiforests open for analysis at the same time.

.L HiForestAnalysis/hiForest.h
HiForest * h1 = new HiForest("/mnt/hadoop/cms/store/user/velicanu/HIMinBias2011_GR_R_53_LV6_CMSSW_5_3_16_Forest_Track8_Jet21_sort/sortedHiForest_0.root","forest1",cPbPb,0,"akPu3Calo")
HiForest * h2 = new HiForest("/mnt/hadoop/cms/store/user/velicanu/hiForest_Jet80or95_GR_R_53_LV6_02Mar2014_1300CET_Track8_Jet15_sort1/sortedHiForest_0.root","forest2",cPbPb,0,"akPu3Calo")

I think this issue is related to the boolean hasPixTrackTree since commenting out everything related to the pixel track tree prevents the crash. More investigation is needed to fully understand what is happening, but I suspect it has something to do with hasPixTrackTree never being checked against the tree's existence:

hasTrackTree     = (trackTree           != 0);

That's nowhere in the class for the pixel track tree.