DRM_amdgpu class returns entries even if AMD GPUs are not present #673
Description
The class_drm_amdgpu.go module will return empty objects if there are no AMD GPUs, but the card[0-9] directory exists. This can happen when NVIDIA GPUs are present instead, and the directories for each will still exist, even though the DRIVER in the event file is not amdgpu.
The empty objects will then be exported as metrics by node_exporter.