Fatal error in lintdiff execution resulting in a healthy automated check when it is expected to fail

[rkmanda]

Before filling a bug

• [ X] have you checked the faq for known issues.
• [ X] have you checked existing issues

In the following run, there was a fatal error encountered. the expectation in such cases is that the fatal error translate into an error for the automated check. However, in this case it resulted in the automated swagger lintdiff check being marked as healthy

https://dev.azure.com/azure-sdk/internal/_build/results?buildId=3491008&view=logs&j=0574a2a6-2d0a-5ec6-40e4-4c6e2f70bea2&t=80c3e782-49f0-5d1c-70dd-cbee57bdd0c7

Please provide as much information as you can. This would be:
- OpenAPI files having the issues
- Autorest command used

Expected behavior The automated check for swagger lintdiff should have failed.

Additional context Add any other context about the problem here.