Add Error Handling to afterSaveLilypondPDF Method

[raghavvvgaba]

Current Behavior

The afterSaveLilypondPDF method in the saveInterface.js file handles post-processing steps for saving a Lilypond file in PDF format. However, no error message is currently displayed in the event of a failure during this process, which could confuse users.

Desired Situation

The method should include an error box message to notify users in case of an error during the post-processing steps. This will improve the user experience by providing clear feedback when something goes wrong.

This is a todo that I'm solving

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.

---

Thank you for contributing to our project! We appreciate your help in improving it.

📚 See contributing instructions.

🙋🏾🙋🏼 Questions: Community Matrix Server.

[anuraag-5]

Hey i can do this todo, can you assign me