Fixes: #8224
1. Summary
All multi-dropdowns across the application don't accept empty options
because emptiness is perceived as an invalid state.
2. Solution
The issue came down to the back-end and the specific string utility
function that converts a string separated by `,` to an array of options.
But the problem with it is that it returns `['']` for an empty string
representing an emptiness. And then `['']` fails on the parser because
simply `''` is not a valid option the user selected for the dropdown. So
I updated the string utility function to return an empty array for cases
like `'', '{}', '{ }'`, etc
3. Recording
https://github.com/user-attachments/assets/071fe5d2-2123-4deb-878c-67f62d9b3431
0bf2cb69da