Fix #4760 - prevent unpacked vars from breaking call when checking unitialised properties

src/Psalm/Internal/Analyzer/ClassAnalyzer.php

@@ -1328,7 +1328,7 @@ class ClassAnalyzer extends ClassLikeAnalyzer
                         return new PhpParser\Node\Arg(
                             new PhpParser\Node\Expr\Variable($param->name, $attributes),
                             false,
-                            false,
+                            $param->is_variadic,
                             $attributes
                         );
                     },

tests/PropertyTypeTest.php

@@ -2179,6 +2179,18 @@ class PropertyTypeTest extends TestCase
                         }
                     }'
             ],
+            'noErrorForSplatArgs' => [
+                '<?php
+                    class Foo {
+                        protected array $b;
+
+                        protected function __construct(?string ...$bb) {
+                            $this->b = $bb;
+                        }
+                    }
+
+                    class Bar extends Foo {}'
+            ],
         ];
     }