How to fix "Non exhaustive 'when' statements on sealed class/interface" in Kotlin

Non exhaustive when statements on sealed class/interface will be prohibited in Kotlin 1.7.

I have a sealed class State and it's children:

sealed class State {
    object Initializing : State()
    object Connecting : State()
    object Disconnecting : State()
    object FailedToConnect : State()
    object Disconnected : State()
    object Ready : State()
}

In some cases I want to handle only particular items, not all, for example:

val state: State = ... // initialize
when (state) {
    State.Ready -> { ... }
    State.Disconnected -> { ... }
}

But I get a warning (in Kotlin 1.7 I guess it will be an error), saying:

Non exhaustive 'when' statements on sealed class/interface will be prohibited in 1.7, add 'Connecting', 'Disconnecting', 'FailedToConnect', 'Initializing' branches or 'else' branch instead

Is it a good practice to use empty else -> {} branch here like in the next code?

when (state) {
    State.Ready -> { ... }
    State.Disconnected -> { ... }
    else -> {}
}

Or need to add every item with an empty brackets like in the following code?

when (state) {
    State.Ready -> { ... }
    State.Disconnected -> { ... }
    State.Connecting,
    State.Disconnecting,
    State.FailedToConnect,
    State.Initializing -> {}
}