Revert "Change default current device to None" #61
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Reverts #39
This change causes crashes in Numba. There are places in Numba with following code
driver.runtime.get_current_device()which returns None. And then it accesses to functions of None... crashes.As I understand the original PR was intended to check if there is current device context or not. It could be achieved in another way without modification of
_curr_device.