bug fix for handling empty lines in input text
@taufique74 first of all, thanks for catching the bug and PR! Since we would prefer to keep the line breaks which fits more the user's expectations i will replace this PR my this one https://github.com/NVIDIA/NeMo/pull/2101
And close this one.
This fixes the empty line issue of `nemo_text_processing/inverse_text_normalization/run_predict.py` discussed in https://github.com/NVIDIA/NeMo/issues/2094

@yzhang123 