Go to line dialog

def go_to_line(self, line=None):
        """Go to line dialog"""
        if line is not None:
            # When this method is called from the flileswitcher, a line
            # number is specified, so there is no need for the dialog.
            self.get_current_editor().go_to_line(line)
        else:
            if self.data:
                self.get_current_editor().exec_gotolinedialog()