fix task.py with no dest_sample_rate task; fix bug in train and infer

mengzhe.cmz

2023-04-12 1ad439f96b8cdbca98ee95b886d692dfa20e85ce

 .gitignore

@@ -7,4 +7,6 @@
init_model/
*.tar.gz
test_local/
RapidASR
RapidASR
export/*
*.pyc