dunglas / go-urlpattern / 31847016393

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fix: prevent panic on syntax-only pathname/hostname pattern components

Some canonicalization callbacks (e.g. hostname, opaque-pathname) can
collapse a non-empty component like "#" down to an empty string.
generatePatternString assumed adjacent fixed-text parts always carry
a non-empty value and indexed into their rune slice unconditionally,
panicking on inputs like URLPatternInit{Protocol: "A", Hostname: "#*0"}.

Guard both indexing sites, and make canonicalizeHostname fail instead
of silently returning an empty hostname for a non-empty forbidden-host-
code-point input, matching the URL spec and the existing ':' guard.

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