Guard create issue button in boards against submitting spaces

What does this MR do and why?

This MR guards when user only inputs white spaces when creating an issue

Repro

• Go to an issue board
• Create an issue via a list using the add button
• Try to add an issue using just whitespaces

Screenshots or screen recordings

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.