pre_seg_text开头加入判断是否全是特殊字符，并防止text为空字符，更改多个换行符的替换的代码 #962
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在text = text.strip("\n") 后面加入判断，防止text为空字符串。
使用正则式来替换原来将\n\n换为\n的式子
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修改GPT_SoVITS/TTS_infer_pack/TextPreprocessor.py 中的 pre-seg-text函数以修复一些bug
在text = text.strip("\n")
后面加入 if not re.sub('\W','', text): text ='' ，如果text都是特殊字符，则记为空字符串。
text.strip后可能得到空字符串，导致使用text[0]出错。所以判断text是否为空，防止text为空字符串时候使用text[0]。
使用正则式text = re.sub(r'\n+','\n', text)
来替换原来的 while "\n\n" in text: text = text.replace("\n\n", "\n")。