Return empty array instead of null

phpstan.neon

@@ -16,7 +16,6 @@ parameters:
         - '#Method Rector\\Node\\NodeFactory::createNamespace\(\) should return PhpParser\\Node\\Stmt\\Namespace_ but returns PhpParser\\Node#' # 1
         - '#Calling method getText\(\) on possibly null value of type PhpParser\\Comment\\Doc\|null#' # 3
         - '#Calling method getParentClassNames\(\) on possibly null value of type Rector\\BetterReflection\\Reflection\\ReflectionClass\|null#' # 1
-        - '#Argument of an invalid type array(?:<array>)\|null supplied for foreach, only iterables are supported#' # 1
         - '#Parameter \#2 \$name of class PhpParser\\Node\\Expr\\PropertyFetch constructor expects PhpParser\\Node\\Expr|string, PhpParser\\Node\\Identifier given#' # 2
         - '#Instanceof between PhpParser\\Node\\Expr\|string and PhpParser\\Node\\Identifier will always evaluate to false#' # 8
         - '#PHPDoc tag @param for parameter \$classLikeNode with type PhpParser\\Builder\\Trait_\|PhpParser\\Node\\Stmt\\Class_\|PhpParser\\Node\\Stmt#' # 1

src/Rector/Dynamic/ArgumentReplacerRector.php

@@ -29,9 +29,9 @@ final class ArgumentReplacerRector extends AbstractRector
     private $methodCallAnalyzer;
 
     /**
-     * @var mixed[][]|null
+     * @var mixed[][]
      */
-    private $activeArgumentChangesByPosition;
+    private $activeArgumentChangesByPosition = [];
 
     /**
      * @var ClassMethodAnalyzer
@@ -108,12 +108,12 @@ final class ArgumentReplacerRector extends AbstractRector
     }
 
     /**
-     * @return mixed[][]|null
+     * @return mixed[][]
      */
-    private function matchArgumentChanges(Node $node): ?array
+    private function matchArgumentChanges(Node $node): array
     {
         if (! $node instanceof ClassMethod && ! $node instanceof MethodCall && ! $node instanceof StaticCall) {
-            return null;
+            return [];
         }
 
         foreach ($this->argumentChangesMethodAndClass as $type => $argumentChangesByMethod) {
@@ -126,7 +126,7 @@ final class ArgumentReplacerRector extends AbstractRector
             }
         }
 
-        return null;
+        return [];
     }
 
     /**