Fix type error in SymfonyConstraintAnnotationReader

[manowark]

Steps to reproduce:

• enable use_validation_groups: true in configuration
• add model property with type array and Assert\Valid constraint on it
• try to build Api Doc

Got array_intersect(): Argument #2 must be of type array, null given in the ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:228

[manowark]

Without fix tests failed like the following:

$ ./phpunit -c phpunit.xml.dist
PHPUnit 9.5.25 #StandWithUkraine

Testing
...............................................................  63 / 204 ( 30%)
..................EE........................................... 126 / 204 ( 61%)
............................................................... 189 / 204 ( 92%)
...............                                                 204 / 204 (100%)

Time: 00:09.969, Memory: 34.00 MB

There were 2 errors:

1) Nelmio\ApiDocBundle\Tests\Functional\ValidationGroupsFunctionalTest::testConstraintGroupsAreRespectedWhenDescribingModels
TypeError: array_intersect(): Argument #2 must be of type array, null given

/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:228
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:192
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:54
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/AnnotationsReader.php:67
/home/user/projects/NelmioApiDocBundle/ModelDescriber/ObjectModelDescriber.php:137
/home/user/projects/NelmioApiDocBundle/Model/ModelRegistry.php:96
/home/user/projects/NelmioApiDocBundle/Model/ModelRegistry.php:117
/home/user/projects/NelmioApiDocBundle/ApiDocGenerator.php:117
/home/user/projects/NelmioApiDocBundle/Tests/Functional/WebTestCase.php:29
/home/user/projects/NelmioApiDocBundle/Tests/Functional/WebTestCase.php:42
/home/user/projects/NelmioApiDocBundle/Tests/Functional/ValidationGroupsFunctionalTest.php:49

2) Nelmio\ApiDocBundle\Tests\Functional\ValidationGroupsFunctionalTest::testConstraintDefaultGroupsAreRespectedWhenReadingAnnotations
TypeError: array_intersect(): Argument #2 must be of type array, null given

/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:228
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:192
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php:54
/home/user/projects/NelmioApiDocBundle/ModelDescriber/Annotations/AnnotationsReader.php:67
/home/user/projects/NelmioApiDocBundle/ModelDescriber/ObjectModelDescriber.php:137
/home/user/projects/NelmioApiDocBundle/Model/ModelRegistry.php:96
/home/user/projects/NelmioApiDocBundle/Model/ModelRegistry.php:117
/home/user/projects/NelmioApiDocBundle/ApiDocGenerator.php:117
/home/user/projects/NelmioApiDocBundle/Tests/Functional/WebTestCase.php:29
/home/user/projects/NelmioApiDocBundle/Tests/Functional/WebTestCase.php:42
/home/user/projects/NelmioApiDocBundle/Tests/Functional/ValidationGroupsFunctionalTest.php:82

[GuilhemN]

Good catch, thank you @manowark!