Logging not working when no route matched

[System-Glitch]

Version: v3.6.0
Environment: Ubuntu 20.04, Go 1.15.6
Reproduces: always

This is not really a bug. Requests that don't match any route (404 or 405) are not logged by the logging middleware, because middleware are only executed if a route is matching.

How it occurred

1. Register the logging middleware
2. Request a non-existing URL or an existing one with the wrong HTTP method
3. Notice nothing is logged

Expected result:
Logging should probably log all requests, including 404 and 405.

How to reproduce

router.Middleware(log.CombinedLogMiddleware())