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.