Fix "PHPDoc tag @phpstan-assert for $array has no value type specified in iterable type"

Author: staabm

src/Framework/MockObject/Generator/MockMethod.php

@@ -226,13 +226,13 @@ public function generateCode(): string
                 'arguments_call'     => $this->argumentsForCall,
                 'return_declaration' => !empty($this->returnType->asString()) ? (': ' . $this->returnType->asString()) : '',
                 'return_type'        => $this->returnType->asString(),
-                'arguments_count'    => $argumentsCount,
+                'arguments_count'    => (string) $argumentsCount,
                 'class_name'         => $this->className,
                 'method_name'        => $this->methodName,
                 'modifier'           => $this->modifier,
                 'reference'          => $this->reference,
                 'clone_arguments'    => $this->cloneArguments ? 'true' : 'false',
-                'deprecation'        => $deprecation,
+                'deprecation'        => $deprecation ?? '',
                 'return_result'      => $returnResult,
             ],
         );