Handle warnings

src/FlightDisplay/FlightDisplayViewMap.qml

@@ -357,7 +357,7 @@ FlightMap {
     // Used to show orbit status telemetry from the vehicle
     QGCMapCircleVisuals {
         mapControl:     parent
-        mapCircle:      _activeVehicle.orbitMapCircle
+        mapCircle:      _activeVehicle ? _activeVehicle.orbitMapCircle : null
         visible:        _activeVehicle ? _activeVehicle.orbitActive : false
     }
 

src/MissionManager/QGCMapCircleVisuals.qml

@@ -24,7 +24,7 @@ Item {
 
     property var    mapControl                                                  ///< Map control to place item in
     property var    mapCircle                                                   ///< QGCMapCircle object
-    property bool   interactive:        mapCircle.interactive   /// true: user can manipulate polygon
+    property bool   interactive:        mapCircle ? mapCircle.interactive : 0   /// true: user can manipulate polygon
     property color  interiorColor:      "transparent"
     property real   interiorOpacity:    1
     property int    borderWidth:        2
@@ -34,7 +34,7 @@ Item {
     property var    _topRotationIndicatorComponent
     property var    _bottomRotationIndicatorComponent
     property var    _dragHandlesComponent
-    property real   _radius:                            mapCircle.radius.rawValue
+    property real   _radius:            mapCircle ? mapCircle.radius.rawValue : 0
 
     function addVisuals() {
         if (!_circleComponent) {