json.sounds is not iterable

[SheepTester]

htmlify project 21554369
reported by https://canary.discord.com/channels/@me/763906065153785886/901938029952925718

Gives

TypeError: json.sounds is not iterable
    at getAssetHashesFromProjectJson (https://sheeptester.github.io/htmlifier/index.bundle.min.js:1:415522)
    at https://sheeptester.github.io/htmlifier/index.bundle.min.js:1:7377134
    at async Htmlifier._createHtml (https://sheeptester.github.io/htmlifier/index.bundle.min.js:1:7376746)
    at async Htmlifier.htmlify (https://sheeptester.github.io/htmlifier/index.bundle.min.js:1:7426098)

I guess sounds may not exist