Warp: Log real requests when app throws an error.

[ChickenProp]

Previously, in this situation the logger would be passed a dummy
request, with no path or method data. Now the logger sees the actual
request, and can log it appropriately.

Before submitting your PR, check that you've:

• Bumped the version number

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

[snoyberg]

Thanks!