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Protection against calling G4ThreadInitTool::terminateThread without having called initThread

John Derek Chapman requested to merge jchapman/athena:Geant4MTFix_ATLASSIM-4062_master into master

Based on the discussion in ATLASSIM-4062, it seems that with the new version of TBB introduced in LCG_95 (see !21493 (merged)) can sometimes try to call G4ThreadInitTool::terminateThread without having first called G4ThreadInitTool::initThread. This causes the G4ExHive-test CI test to fail at random. Adding some protection to G4ThreadInitTool::terminateThread to prevent crashes in this case while the experts follow up with the TBB experts.

Edited by John Derek Chapman

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