🪲 Fix front-end print statement missing warning for music

[LiberCas]

This PR solves the issue of warning messages appearing on music adventures when no print statement is present

In spite of not requiring print statements to output, until now submitting a piece of code to a music adventure without including a print statement would result in a warning such as in the following example:

I have solved the issue by checking whether the adventure has any music before issuing the warning in a similar manner to what is done with adventures including turtles

Fixes #5000

How to test

Follow these steps to verify this PR works as intended:

• Go to http://localhost:8080/hedy/1#music
• Type:

play C4

*Check that no warning appears:

[Felienne]

Thanks for your first Hedy PR @LiberCas!! Welcome to the team.

Let us know if you want to pick up other things (are you on the Discord yet?)

[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).

[LiberCas]

You're welcome @Felienne, it's been a pleasure to help!

I'm in university right now so I don't have much time, but when summer vacation comes up I might be able to give you guys a more active hand.

Love the project btw❤️