code: def open_window(self, widget, data=None):
          
          if data is not None:
              self.data = data
          os.chdir(os.path.expanduser('~'))
          self.kwargs = dict()
          self.main_win.show_all()
docs: Function opens Main Window and in case of previously created
          project is switches to /home directory
          This is fix in case that da creats a project
          and project was deleted and GUI was not closed yet