Bug: setVolume triggers an error if no song has been loaded yet

[yvesgurcan]

Environment

• Version of web-midi-player: 1.3.11
• Browser: Chrome
• Operating system: MacOS
• Device model: iMac

Bug

Describe the issue as specifically as possible.

This bug is visible on the React example of the library. If you try to update the volume of the player before attempting to load a song, the code will trigger an error and not update the volume.

Expected behavior

What did you expect to happen?

The volume should be updated to the correct value and not trigger an error. Also, the song that I play after setting the volume should be played at the new volume.

Screenshot