Fix multi-dropdown field can't have no options selected

[khuddite]

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

CleanShot.2024-11-07.at.13.43.46.mp4

[greptile-apps]

PR Summary

This change fixes multi-dropdown fields not accepting empty options by modifying how empty string values are handled in the backend formatting logic.

• Modified format-result.util.ts to return empty array [] instead of [''] for empty multi-select values
• Updated string parsing to properly handle empty strings, '{}', and '{ }' patterns
• Fixed validation error that occurred when trying to unselect all options in multi-select fields
• Ensures consistent empty state handling across all multi-dropdown fields in the application

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[greptile-apps]

style: Consider handling null/undefined values explicitly before the string check to prevent potential runtime errors

[FelixMalfait]

Great work thank you!