Update HAS_GPU variable to account for CUDA_VISIBLE_DEVICES
#221
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Fixes #220
Update HAS_GPU variable to account for the
CUDA_VISIBLE_DEVICESenvironment variable.This is to handle the case where this env var is set to an empty string
CUDA_VISIBLE_DEVICES="". In this case RAPIDS cudf and other libaries that use CUDA will not detect a GPU.