[PHPUnit12] Handle crash on property not exists on PropertyCreateMockToCreateStubRector

[samsonasik]

Given the following code:

use PHPUnit\Framework\TestCase;

final class SkipPropertyNotExistsTest extends TestCase
{
    protected function setUp(): void
    {
        $this->someMock = $this->createMock(\stdClass::class);
    }

    public function testThis()
    {
        $this->assertSame('...', $this->someMock);
    }
}

It got crash:

1 test triggered 1 PHP warning:

1) /Users/samsonasik/www/rector-phpunit/rules/PHPUnit120/Rector/Class_/PropertyCreateMockToCreateStubRector.php:75
Attempt to read property "type" on null

Ref https://getrector.com/demo/805aa088-6c4d-4809-84e2-ccc2fd8e6fd1
Fixes rectorphp/rector#9774

[samsonasik]

Fixed 🎉 /cc @gemal

[samsonasik]

All green 🎉 @TomasVotruba let's merge 👍