* conversion: use existing local chat_template.jinja file if mistral-format model has one.
* fix --mistral-format mistakenly assuming some <=v7 chat template names are file paths and reading them.
* Update convert_hf_to_gguf.py - change from exists() to is_file()
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* fix convert_hf_to_gguf.py failing with --mistral-format using later mistral-common versions.
* use get_one_valid_tokenizer_file from mistral-common if available and fallback to old logic otherwise.
* use file name instead of file path for get_one_valid_tokenizer_file.
* fix --mistral-format tokenizer file failing for tokenizers in subdirectories.
* move get_one_valid_tokenizer_file import to avoid nested try-except.
