Warning: Undefined array key 2 in class-gallery.php on line 168

[mirlanbekturov]

Description of the bug

A PHP warning occurs when the code tries to access an array key that may not exist.
The issue happens in class-gallery.php at line 168 when using the following expression:

! empty( trim( $matches[2] ) )

Proposed Fix

! empty( trim( $matches[2] ?? '' ) )

Steps To Reproduce

1. Trigger the Apple News export process on a post that does not produce a full regex match with index
2. Observe PHP logs or browser console for warnings.
3. See the Undefined array key 2 warning in the logs.

Additional Information

No response