wix: bug fix at startup when the method chatStateReceived doesn't exist

TODO: implementation for displaying the states on the chat window and sending "composing" states

frontends/src/wix/main_window.py

@@ -489,3 +489,11 @@ class MainWindow(wx.Frame, QuickApp):
             self.Raise()
         e.Skip()
 
+    def chatStateReceived(self, from_jid_s, state, profile):
+        """Signal observer to display a contact chat state
+        @param from_jid_s: contact who sent his new state
+        @state: state
+        @profile: current profile
+        """
+        print "TODO: chatStateReceived not implemented yet"
+        pass