…section

…h a missing section

…fetch a mis… (Alex Niedre)

This PR was merged into the 7.2 branch.

Discussion
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[Stopwatch] bug #54854  undefined key error when trying to fetch a mis…

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | yes
| New feature?  |no
| Deprecations? |no
| Issues        | Fix #54854
| License       | MIT

A minor bug was introduced in the related referenced issue which caused an unidentified key exception to trigger when referencing a section that was missing.

Reproduced here, as an example: https://3v4l.org/OFFLB

This MR addresses that and adds a simple test to prevent the same mistake in the future.

Commits
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c3cf577 bug #54854 [Stopwatch] undefined key error when trying to fetch a missing section

* 7.2:
  [SecurityBundle] Do not replace authenticators service by their traceable version
  [Finder] Fix using `==` as default operator in `DateComparator`
  bug #54854 [Stopwatch] undefined key error when trying to fetch a missing section
  [HttpFoundation] Avoid mime type guess with temp files in `BinaryFileResponse`
  choose the correctly cased class name for the MariaDB platform

* upstream/7.3:
  [SecurityBundle] Do not replace authenticators service by their traceable version
  reject URLs containing whitespaces
  [Finder] Fix using `==` as default operator in `DateComparator`
  Update validators.fa.xlf
  the "max" option can be zero
  [PropertyInfo] Remove `@internal` directives to allow extensions with no static-analysis errors
  [TypeInfo] Fix PHPDoc resolving of union with mixed
  [Security/Csrf] Trust "Referer" at the same level as "Origin"
  bug symfony#54854 [Stopwatch] undefined key error when trying to fetch a missing section
  [HttpClient] Fix a typo in NoPrivateNetworkHttpClient
  [HttpFoundation] Avoid mime type guess with temp files in `BinaryFileResponse`
  choose the correctly cased class name for the MariaDB platform
  fix test method parameter names