Fixed a bug when creating first account

src/cutecoin/core/app.py

@@ -99,6 +99,7 @@ class Application(QObject):
             self.loading_progressed.emit(value, maximum)
 
         if self.current_account is not None:
+            if self.monitor:
                 self.monitor.stop_watching()
             self.save_cache(self.current_account)
         account.loading_progressed.connect(progressing)