Warn instead of throw error in chat template

[EricLBuehler]

[github-actions[bot]]

Code Metrics Report

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 Language            Files        Lines         Code     Comments       Blanks
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 TOML                   16          444          403            1           40
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 Jupyter Notebooks       1            0            0            0            0
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 Markdown               19         1364            0         1022          342
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 Rust                  121        37354        33750          684         2920
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 Total                 201        40915        35643         1744         3528
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[step21]

If this is what I think it is, I would be in favour of this being merged. Like f.e. every time an image does not load or something else in the chat is wrongly formatted, it takes some time to load especially as in-situ-quantization only uses 1 core. (why is that anyway, is that a mistral.rs choice or is that set somewhere else?)