Resolves #7740.

Proposed Changes

Checks if $questions_array is empty before running code that manipulates it.

Testing Instructions

I wasn't actually able to reproduce, but this is a fairly benign change that should resolve the fatal.

Pre-Merge Checklist

• PR title and description contain sufficient detail and accurately describe the changes
• Adheres to coding standards (PHP, JavaScript, CSS, HTML)
• All strings are translatable (without concatenation, handles plurals)
• Follows our naming conventions (P6rkRX-4oA-p2)
• Hooks (p6rkRX-1uS-p2) and functions are documented
• New UIs are responsive and use a mobile-first approach
• Code is tested on the minimum supported PHP and WordPress versions