Single microphone results in blank box

[rzhao271]

Testing #328440

With one normalized physical microphone, confirm its name is shown as a label and no dropdown picker appears.

No dropdown picker appears, but no name is shown in the selectbox, either. The selectbox is empty when there is only one microphone.

[meganrogge]

This is when the onboarding card is shown

[meganrogge]

I actually think we should just omit the selectbox and not show the name of the mic in this case.