The filter to enable webP along with AVIF isnot working

[Mai-Saad]

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Describe the bug When using a filter to generate webp along with avif then we upload image , we will have this warning and webp won't be generated [27-Feb-2024 14:10:58 UTC] PHP Warning: Undefined array key "size" in /home/mai/Local Sites/imagifynginx6/app/public/wp-content/plugins/imagify-plugin/classes/Optimization/Process/AbstractProcess.php on line 1540 To Reproduce Steps to reproduce the behavior:

1. Enable AVIF

2. use a filter to enable webP

   add_filter('imagify_nextgen_images_formats', function($formats){
   $formats['webp'] = 'webp';
   
   return $formats;
   });

3. upload image (small/big)
4. check ftp and debug.log => webp not generated and warning in log

Expected behavior No warning and webP generated

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Acceptance Criteria (for WP Media team use only) Clear instructions for developers, to be added before the grooming