Use null controller as fake route to be dumpable
merged branch GromNaN/null-controller (PR #775)

This PR was merged into the master branch.

Discussion
----------

[Security] Make fake routes dumpable by setting NULL as controller

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #774
| License       | MIT

By setting `NULL` as controller, the route will end in 404 error if it's not bypassed by a security listener.

Commits
-------

5e2c4b6 Use null controller as fake route to be dumpable