Fix: Added checks before removing event listeners

[Sanketjadhav31]

Resolves #618

Changes:

• Fixed potential runtime errors by ensuring removeEventListener is only called when the target element and handler exist.
• Added checks to prevent calling removeEventListener on undefined values in the main.js file.

Screenshots of the change:

Not applicable

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PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

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[Sanketjadhav31]

Hi ,
This PR resolves issue #5404. I made changes in the main.js file to fix the placement issue of textLeading() in the reference sidebar. Now it correctly links to the right function. Let me know if any improvements are needed. Thank you!

[ksen0]

Hi @Sanketjadhav31 can you explain how this PR relates to the original issue? Also, the original issue looks closed?

Regarding this PR: in which situation are those properties missing, that requires this checks? Additionally, rather than silently suppressing the error, could you log a more descriptive message?

Thank you!