Updated the checkExistence method to allow the wrapper to be null in the case of primitives like ints that do not have a wrapper associated with them.
Updated the checkExistence method to allow the wrapper to be null in the case of primitives like ints that do not have a wrapper associated with them.

SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk