Exit battery sensor retrival if path is non-existent #2438
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Summary
/sys/class/power_supplyis missingDescription
This PR extends the solution for issue #966. In my case, the path
/sys/class/power_supplyis missing completely other than having different variations of files below theBATxdirectory. To be fair, I only encountered this condition with an Ubuntu image provided by a hosting company, but I think, it's better to catch this issue in general.