def start_waiting(self):
        """
        Show waiting progress bar until done_waiting is called.
        Only has an effect if we are in waiting state.
        """
        if not self.waiting:
            self.waiting = True
            wait_msg = "Waiting for project to become ready for {}".format(self.msg_verb)
            self.progress_bar.show_waiting(wait_msg)
Show waiting progress bar until done_waiting is called.
        Only has an effect if we are in waiting state.