* caddyhttp: Fix fallback for the error handler chain
The fix I went with in the end (after realizing some mistaken assumptions in #4131) is to just make the routes fall back to errorEmptyHandler instead of the non-error empty handler, if Terminal is true, making the routes error-aware. Ultimately this was probably just an oversight when errors was implemented at some point in the early betas of v2.
See https://caddy.community/t/problem-with-basicauth-handle-errors/12243/9 for context.
* Revert "caddyhttp: Fix fallback for the error handler chain"
This reverts commit 95b6ac44a6122d3ca5513a13bbc723cd5f4785f8.
* caddyhttp: Fix via `routes.go`
d4b2f1bcee