final Site fakeSiteWithProperName = Components.newInstance(currentSite.getClass());

This class can be e.g. Site$$EnhancerByCGLIB$$51b83c2e. Instance of such class then fails with NPE on setName().

Step to reproduce locally :

1. Create forward mapping:

• class=info.magnolia.cms.beans.config.DefaultVirtualURIMapping
• fromURI=/test
• toURI=forward:/demo-project

1. Change domain name to localhost.
2. http://localhost:8080/magnoliaAuthor/test desktop works
3. http://localhost:8080/magnoliaAuthor/test?mgnlChannel=smartphone white page