[2.3] [HttpFoundation] [MimeTypeGuesser]
[2.3] [HttpFoundation] [MimeTypeGuesser]

Updated exception message in MimeTypeGuesser when no guessers available
(issue #12857).

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12857
| License       | MIT
| Doc PR        | none

mneuhaus/HttpFoundation,ygerasimov/HttpFoundation,oswaldderiemaecker/HttpFoundation,symfony/http-foundation,nichdu/HttpFoundation,symfony/HttpFoundation