We have defined external pages for "RFC 6749", "RFC6749 -", "åøæ", "小部件" and "—".
RFC 6749
RFC 6749 -
A link like this should fail: \l{RFC 6749-}
A link like this should fail: \l{-RFC 6749}
åøæ
小部件
---
An empty link will fail: \l{}