Fix loading of old .mission file format

src/MissionManager/MissionController.cc

@@ -500,7 +500,7 @@ bool MissionController::_loadJsonMissionFileV2(const QJsonObject& json, QmlObjec
         { _jsonPlannedHomePositionKey,      QJsonValue::Array,  true },
         { _jsonItemsKey,                    QJsonValue::Array,  true },
         { _jsonFirmwareTypeKey,             QJsonValue::Double, true },
-        { _jsonVehicleTypeKey,              QJsonValue::Double, true },
+        { _jsonVehicleTypeKey,              QJsonValue::Double, false },
         { _jsonCruiseSpeedKey,              QJsonValue::Double, false },
         { _jsonHoverSpeedKey,               QJsonValue::Double, false },
     };
@@ -515,8 +515,10 @@ bool MissionController::_loadJsonMissionFileV2(const QJsonObject& json, QmlObjec
 
     if (_masterController->offline()) {
         // We only update if offline since if we are online we use the online vehicle settings
-        appSettings->offlineEditingFirmwareType()->setRawValue(AppSettings::offlineEditingFirmwareTypeFromFirmwareType((MAV_AUTOPILOT)json[_jsonVehicleTypeKey].toInt()));
-        appSettings->offlineEditingVehicleType()->setRawValue(AppSettings::offlineEditingVehicleTypeFromVehicleType((MAV_TYPE)json[_jsonVehicleTypeKey].toInt()));
+        appSettings->offlineEditingFirmwareType()->setRawValue(AppSettings::offlineEditingFirmwareTypeFromFirmwareType((MAV_AUTOPILOT)json[_jsonFirmwareTypeKey].toInt()));
+        if (json.contains(_jsonVehicleTypeKey)) {
+            appSettings->offlineEditingVehicleType()->setRawValue(AppSettings::offlineEditingVehicleTypeFromVehicleType((MAV_TYPE)json[_jsonVehicleTypeKey].toInt()));
+        }
     }
     if (json.contains(_jsonCruiseSpeedKey)) {
         appSettings->offlineEditingCruiseSpeed()->setRawValue(json[_jsonCruiseSpeedKey].toDouble());