URL does not contain host when resolving a page for a language that only has wildcard mapping

Description

Steps to reproduce
1. Add or modify the wildcard host mapping to have a language mapping ("sv").
2. Ensure there is no other host mapped for that language ("sv").
3. Map the primary site to another language ("en").
4. Add a second site with single language ("sv").
5. Create a page on the first site that exists in both languages.
6. Create a link from the second site to the created page on the first site.

Expected: This should not be valid to save, since there is no host defined for this language on this site
Actual: URL is always without a host, which means that language is based on the primary site language.

Breaking change
It is no longer allowed to have the wildcard host as the only host for any given language. A wildcard host must now always be accompanied by a (non-redirect) host defined for the same culture.