Fix panic in formatting not found message (#276)
Fix panic that was found in the logs, `targetOpt` is `nil`:
http2: panic serving 10.0.3.1:[...]: runtime error: invalid memory address or nil pointer dereference
net/http.(*http2serverConn).runHandler.func1()
/usr/local/go/src/net/http/h2_bundle.go:6104 +0x145
panic({0x19c6820, 0x2d66db0})
/usr/local/go/src/runtime/panic.go:884 +0x213
codeberg.org/codeberg/pages/server/handler.handleSubDomain({{0x2008c68, 0xc00047df90}, 0x2, {0x0, 0x0}, {0xc0fe3ef800, 0x55, 0x1f4}, {0xc00047dfa0, 0x1, ...}, ...}, ...)
/woodpecker/src/codeberg.org/Codeberg/pages-server/server/handler/handler_sub_domain.go:59 +0x5e0
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/276
Reviewed-by: crapStone <codeberg@crapstone.dev>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>
15916444e1