SDKtool: Fix adddevice operation

Change-Id: I7bd3813bab7a8006ab418990f0e742be7d6f400a
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/tools/sdktool/adddeviceoperation.cpp

@@ -361,7 +361,7 @@ QVariantMap AddDeviceOperation::addDevice(const QVariantMap &map,
 QVariantMap AddDeviceOperation::initializeDevices()
 {
     QVariantMap dmData;
-    dmData.insert(QLatin1String(DEFAULT_DEVICES_ID), QVariant());
+    dmData.insert(QLatin1String(DEFAULT_DEVICES_ID), QVariantMap());
     dmData.insert(QLatin1String(DEVICE_LIST_ID), QVariantList());
 
     QVariantMap data;