[basicUI] Mappings with only one entry not correctly rendered

[lolodomo]

Which UI are you reporting an issue for?

• Basic UI
• HABPanel
• HABot
• CometVisu

The problem

Mappings with only one entry are not correctly rendered.

My item:

Switch MuteAutoNoUpdate "mute (no autoupdate)" <mute> {channel="xxx"}

My sitempa:

    Frame label="Mappings - autoupdate" {
        Switch item=MuteAutoNoUpdate
        Switch item=MuteAutoNoUpdate mappings=[ON="Muet"] 
        Switch item=MuteAutoNoUpdate mappings=[ON="Mute", OFF="Listen"] 
    }

The sound is muted so the item state is OFF.
Here is how it looks when I open the page:

The second widget (at right) is not as expected, it should be shown as "ppushed". It should be rendered similar as with the third widget.

Expected behavior

It shoud like this when I open the page while the device is muted:

And like this when the device is unmuted:

The problem is clearly in SwitchRenderer where "mdl-button--accent" is not set when there is only one button !

[lolodomo]

Note that it is working well in Android app.