Optimize innerBlocks loop

[aatanasov-cloudinary]

Fixes:

PHP Warning:  Undefined array key "innerBlocks" in /wp-content/plugins/cloudinary-image-management-and-manipulation-in-the-cloud-cdn/php/media/class-video.php on line 245
PHP Warning:  foreach() argument must be of type array|object, null given in /wp-content/plugins/cloudinary-image-management-and-manipulation-in-the-cloud-cdn/php/media/class-video.php on line 245

Approach

• Ensure only blocks with innerBlocks are looped.

QA notes

• Insert a Video inside a block that supports innerBlocks (e.g. columns).
• Go to the Editor and the front-end page.
• The PHP Warnings shouldn't appear in the debug.log.

[gabrielcld2]

Confirmed the issue is fixed ✅