fix: JSON parse error on vGPU validation

[yulken]

Summary

Fixes #16086

Occurred changes and/or fixed issues

Technical notes summary

The fallback scenario was failing due to an empty string

Areas or cases that should be tested

Browser used for local testing: Google Chrome
Steps to reproduce are in the attached issue.

Areas which could experience regressions

Screenshot/Video

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[a110605]

Thanks for the fixing. Looks good to me.

[houhoucoop]

LGTM