Fix crash when special tokens aren't found in model config. #60
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Some models such as
sentence-transformers/all-MiniLM-L12-v2
don't have special tokens such as "bos_token" in their tokenizer configuration. This causes a key error when the warmup logic tries to get the id for these tokens. However, since the IDs are only used to exclude them from the set of tokens that can be generated during the warmup, it doesn't make a difference if they don't exist.