[Php80] Handle crash on ClassOnObjectRector + GetDebugTypeRector

[samsonasik]

Fixes rectorphp/rector#8050

[samsonasik]

It show warning in unit test:

W                                                                   1 / 1 (100%)

Time: 00:00.664, Memory: 72.50 MB

1 test triggered 2 PHP warnings:

1) Rector\Core\Tests\Issues\ClassOnObjectGetDebugType\ClassOnObjectGetDebugTypeTest::test with data set #0
* Undefined property: PhpParser\Node\Expr\Variable::$args
  /Users/samsonasik/www/rector-src/rules/Php80/Rector/Ternary/GetDebugTypeRector.php:170

* Trying to access array offset on value of type null
  /Users/samsonasik/www/rector-src/rules/Php80/Rector/Ternary/GetDebugTypeRector.php:170

/Users/samsonasik/www/rector-src/tests/Issues/ClassOnObjectGetDebugType/ClassOnObjectGetDebugTypeTest.php:14

see https://github.com/rectorphp/rector-src/actions/runs/5525624780/jobs/10079443737#step:5:25

[samsonasik]

Fixed 🎉 /cc @canvural

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it ;)

Before: show warning in unit test: https://github.com/rectorphp/rector-src/actions/runs/5525624780/jobs/10079443737#step:5:25

After: no warning in unit test: https://github.com/rectorphp/rector-src/actions/runs/5525654777/jobs/10079508540#step:5:27