bug(editor): infinite loop in empty externalLink

[yhx-12243]

When I input something like {{doi:}} in editor, the parser will get an empty token (

web/packages/core/src/Parser/links.ts

Lines 133 to 149 in c7c979a

	function externalId(code: Code) {
	debug('externalId %s', code)
	if (code === cr || code === lf || code === crlf || code === eof) {
	return nok(code)
	}
	if (code === rightBrace) {
	effects.exit('chunkString')
	effects.exit('externalId')
	effects.exit('externalLink')
	effects.enter('linkMarker')
	return close(code)
	}
	effects.consume(code)
	return externalId
	}

), which is not allowed by micromark, in development mode it'll throw a warning (https://github.com/micromark/micromark/blob/4c09ff6682b3843b47b63238e4ed9e6f6ebcba4f/packages/micromark/dev/lib/create-tokenizer.js#L329-L335), and get UB (e.g., dead loop) on release and the user get annoyed.

(I don't know how to fix it because the error can regards as that the library does not accept empty token, in some sense)

1.mov