Fix "Strict comparison using !== between ReflectionClass and null will always evaluate to true."

Author: staabm

src/Framework/MockObject/Generator/Generator.php

@@ -776,7 +776,7 @@ private function generateCodeForTestDoubleClass(string $type, bool $mockObject,
 
         if (is_array($explicitMethods)) {
             foreach ($explicitMethods as $methodName) {
-                if ($class !== null && $class->hasMethod($methodName)) {
+                if ($class->hasMethod($methodName)) {
                     $method = $class->getMethod($methodName);
 
                     if ($this->canMethodBeDoubled($method)) {