Max Wipfli 932161e581 LibWeb: Be more forgiving when adding source positions in HTMLTokenizer ...

This patch changes HTMLTokenizer::nth_last_position to not fail if the
requested position is not available. Rather, it will just return (0-0).

While this is not the correct solution, it prevents the tokenizer from
crashing just because it cannot find a source position. This should only
affect SyntaxHighlighter.

2021-06-05 00:32:28 +04:30

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