Make convert-pt-to-ggml.py backwards compatible with older vocab.json tokenizer files#1001

ggerganov merged 2 commits intoggml-org:masterggml-org/whisper.cpp:masterfrom

akashmjn:ggml-convert-hf_tokakashmjn/whisper.cpp:ggml-convert-hf_tokCopy head branch name to clipboard