…tice (leevigraham)

This PR was merged into the 3.4 branch.

Discussion
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[Console] SymonfyStyle - Check value isset to avoid PHP notice

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #34093
| License       | MIT
| Doc PR        | n/a

This PR addresses the issue when a default value is not a valid choice. Currently this would throw a notice which outputs to the console.

This fix is a similar implementation to the `QuestionHelper`: https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Console/Helper/QuestionHelper.php#L63

Example console command and output can be found in the issue: #34093

Commits
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c9072c70ef Check value isset to avoid PHP notice

* 3.4:
  [Phpunit] Fix running skipped tests expecting only deprecations
  [DependencyInjection] #35505 Fix typo in test name
  [Yaml][Inline] Fail properly on empty object tag and empty const tag
  Check non-null type for numeric type
  Check value isset to avoid PHP notice
  bug symfony#28179 [DomCrawler] Skip disabled fields processing in Form

* 3.4:
  Fix CS

* 3.4:
  fix unix root dir issue
  sync validator translation files with master
  fix anchor
  fix links to releases page (formerly known as "roadmap")
  [Console] Don't load same-namespace alternatives on exact match found

* 3.4:
  [ExpressionLanguage] Fixed collisions of character operators with object properties
  [Validator] Remove specific check for Valid targets
  [PhpUnitBridge] Use trait instead of extending deprecated class
  fix remember me
  Use strict assertion in asset tests
  [DoctrineBridge][DoctrineExtractor] Fix indexBy with custom and some core types
  Do not rely on the current locale when dumping a Graphviz object
  fix typo
  [Ldap] force default network timeout
  [Config] don't throw on missing excluded paths
  Docs: Typo, grammar
  [Validator] Add the missing translations for the Polish ("pl") locale
  [Console] Inline exact-match handling with 4.4
  Set previous exception when rethrown from controller resolver
  [VarDumper] fixed DateCaster not displaying additional fields
  [HttpKernel] fix registering DebugHandlersListener regardless of the PHP_SAPI