Fix issue symfony/symfony#10345 '[FrameworkBundle][Console] container:debug --parameter="" not working anymore'
bug #10363 [FrameworkBundle][Console] Fix issue #10345 container:debug --parameter="" not working anymore (FineWolf)

This PR was merged into the 2.4 branch.

Discussion
----------

[FrameworkBundle][Console] Fix issue #10345 container:debug --parameter="" not working anymore

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes*
| Fixed tickets | #10345
| License       | MIT
| Doc PR        | N/A

## TODO
- [x] Fix issue #10345
- [ ] Create unit test for `describeContainerParameter`

Commits
-------

b278aa4 Fix issue symfony/symfony#10345 '[FrameworkBundle][Console] container:debug --parameter="" not working anymore'