fix new 2019 crash when deleting asset history when the Evaluation Manager is  on by turning the EM off while deleting asset history.
fix new 2019 crash when deleting asset history when the Evaluation Manager is  on
by turning the EM off while deleting asset history.

sideeffects/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya