fix Qt Database error message when close the app

src/gui/generic/serverguiwrapper.h

@@ -37,6 +37,7 @@ public:
     void setSession(boost::shared_ptr<Session> session);
 
     gameTableImpl* getMyW() const {return NULL;}
+    Log* getMyLog() const {return NULL;}
 
     void refreshSet() const;
     void refreshCash() const;