fix: Allow removing T-Shirt size option for participants #2229

[Xetoxyc]

maybeV is undefined if tShirtSize is removed

When tShirtSize is removed/undefined, maybeV becomes undefined but still gets processed through the uppercase conversion in the default switch case, causing unexpected behavior.

fixes #2229

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[Narigo]

Thanks, this works for all of these cases now:

{
  "tShirtSize": undefined,
  "tShirtSize": null,
  "tShirtSize": "",
  "tShirtSize": false,
  "tShirtSize": 0,
}

and removing "tShirtSize" field altogether!

I like it, thank you!