miyuchina / mistletoe / 28782428816

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fix: guard remove_token against duplicate removal

MarkdownRenderer.__init__ calls block_token.remove_token(Footnote),
but if the renderer is instantiated multiple times without proper
context-manager cleanup (reset_tokens in __exit__), the second call
crashes with ValueError because Footnote is already gone.

Add an 'in' guard to both block_token.remove_token and
span_token.remove_token so the call is a no-op if the token
has already been removed.

Fixes #262

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