[syncthing deployment] Fix cases where there is no pending devices in…

… syncthing-depl config.xml

pulse_xmpp_agent/agentxmpp.py

@@ -741,7 +741,7 @@ def synchro_synthing(self):
             return
         if len(config) == 0:
             return
-        if len(config['pendingDevices']) > 0:
+        if 'pendingDevices' in config and len(config['pendingDevices']) > 0:
             if self.pendingdevice_accept(config):
                 self.syncthingreconfigure = True;
             config['pendingDevices']=[]