Fix timestamp prediction on empty ASR outputs

Yuanhang Zhang

2023-03-21 3b3aebb1247d29894c34c06ab4837c13917e4967

 funasr/utils/timestamp_tools.py

@@ -17,7 +17,7 @@
                       sil_in_str=True
                       ):
    if not len(char_list):
        return []
        return "", []
    START_END_THRESHOLD = 5
    MAX_TOKEN_DURATION = 12
    TIME_RATE = 10.0 * 6 / 1000 / 3  #  3 times upsampled