[Php56] Handle jump not Expression stmt next initialized on AddDefaultValueForUndefinedVariableRector

[samsonasik]

Continue of #2721, when initialized, but jumped in not Expression after Stmt, it should be processed like this:

class InitializedJumpNext
{
    public function run()
    {
        if (rand(0, 1)) {
            echo $a;
        }

        $a = null;

        if (rand(0, 1)) {
            $a = 5;
        } else if (rand(0,1)) {
            unset($a);
        }

        echo $a;
    }
}

should be processed to:

     public function run()
     {
+        $a = null;
         if (rand(0, 1)) {

[samsonasik]

Fixed 🎉

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.