What is the problem?

Ray version and other system information (Python version, TensorFlow version, OS):
1.0.0 release.

Reproduction (REQUIRED)

Please provide a script that can be run to reproduce the issue. The script should have no external library dependencies (i.e., use fake or mock data / environments):

If we cannot run your script, we cannot fix your issue.

This issue was reported by Pieterjan, and I believe it doesn't need reproduction, only to properly handle the case where that data is missing with something like an N/A. I hadn't realized that that field was optional from the gpustat library.

• I have verified my script runs in a clean environment and reproduces the issue.
• I have verified the issue also occurs with the latest wheels.