aqhome-nodes: only announce values if uid != 0 and != -1

Those ids occur for freshly assembled nodes.

apps/aqhome-nodes/db.c

@@ -248,7 +248,8 @@ void _handleMsgDevice(AQHOMED *aqh, const GWEN_MSG *msg)
       _assignDeviceId(aqh, ni, uid);
     _updateTimestampLastChange(ni);
     AQH_NodeDb_SetModified(aqh->nodeDb);
-    _announceNodeValues(aqh, ni);
+    if (uid!=0x00000000L && uid!=0xffffffff)
+      _announceNodeValues(aqh, ni);
   }
   else {
     DBG_INFO(AQH_LOGDOMAIN, "Error handling message");