fix: crash when err.originalError is unset

[will-hart]

Description

If err.originalError is unset in the graphql error formatting, the server returns an error response without any information useful for debugging the original error.

Motivation and Context

Report the initial error.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Documentation Changes

Checklist:

• [x] My code follows the code style of this project.
• [x] My commit messages follow the Conventional Commits specification.
• [ ] My change requires a change to the documentation.
• [ ] I have included updates for the documentation accordingly.