[TTS]特殊的句子及标点导致报错

[arashrun]

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Describe the bug
特殊句式导致报错

To Reproduce
报错句子：并且——说来会使他惭愧——是以庄重口气谈到的,

Expected behavior
正常生成

Screenshots

Loading model cost 0.382 seconds.
DEBUG 2022-10-22 17:58:41,857 __init__.py:164] Loading model cost 0.382 seconds.
Prefix dict has been built successfully.
DEBUG 2022-10-22 17:58:41,857 __init__.py:166] Prefix dict has been built successfully.
[并且——说来会使他惭愧——是以庄重口气谈到的,] not in g2pW dict,use g2pM
Traceback (most recent call last):
  File "C:\Users\ming\Desktop\1\2.py", line 28, in <module>
    tts(text=text, output="output.wav")
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\cli\utils.py", line 328, in _warpper
    return executor_func(self, *args, **kwargs)
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\cli\tts\infer.py", line 684, in __call__
    self.infer(text=text, lang=lang, am=am, spk_id=spk_id)
  File "C:\Users\ming\envs\b-site\lib\site-packages\decorator.py", line 232, in fun
    return caller(func, *(extras + args), **kw)
  File "C:\Users\ming\envs\b-site\lib\site-packages\paddle\fluid\dygraph\base.py", line 354, in _decorate_function
    return func(*args, **kwargs)
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\cli\tts\infer.py", line 445, in infer
    frontend_dict = run_frontend(
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\exps\syn_utils.py", line 195, in run_frontend
    input_ids = frontend.get_input_ids(
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\frontend\zh_frontend.py", line 517, in get_input_ids
    phonemes = self.get_phonemes(
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\frontend\zh_frontend.py", line 437, in get_phonemes
    phonemes = self._g2p(
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\frontend\zh_frontend.py", line 243, in _g2p
    sub_finals = self.tone_modifier.modified_tone(word, pos,
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\frontend\tone_sandhi.py", line 352, in modified_tone
    finals = self._neural_sandhi(word, pos, finals)
  File "c:\users\ming\envs\b-site\paddlespeech\paddlespeech\t2s\frontend\tone_sandhi.py", line 89, in _neural_sandhi
    finals[-1] = finals[-1][:-1] + "5"
IndexError: list index out of range

[yt605155624]

正则化时需要对 —— 这个特殊符号进行过滤，欢迎提交 pr 修复