HMI AlertManeuver pop-up is shown in case Navi.AlertManeuver request contains only appID

[VjKlepikov]

Description:
HMI AlertManeuver pop-up is shown in case Navi.AlertManeuver request contains only appID

Precondition:

1. SDL and HMI are started
2. Media mobile app is registered and activated

Steps to reproduce:

1. Mobile app requests AlertManeuver RPC without softButtons

Expected result:
HMI does not show AlertManeuver pop-up, shows only TTS.Speak related to AlertManeuver request

Actual result:
HMI shows the empty AlertManeuver pop-up

Environment:
SDL: https://github.com/smartdevicelink/sdl_core/tree/7.1.0-RC1
HMI: https://github.com/smartdevicelink/sdl_hmi/tree/develop (7fad546)
SPT: SPT: 20210305-Android (1076)

[jacobkeeler]

    <param name="softButtons" type="Common.SoftButton" minsize="0" maxsize="3" array="true" mandatory="false">
      <description>If omitted, only the system defined "Close" SoftButton should be displayed.</description>
    </param>

@VjKlepikov this looks like expected behavior (although I think that including some sort of info message would make it less confusing)

[jacobkeeler]

I created a PR to make the layout look a little clearer in this case, see #565

[jacobkeeler]

Closing with the merge of #565