Description of problem:
If you don't install brand packages and try to build a book it fails, but
doesn't say: "Hey, you don't have a brand package installed" or "Your brand
doesn't match anything I can do". Instead it gives a cryptic message and then
goes away crying.

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. install documentation-devel without any other brand packages then try
building something
2. or set the brand to something that doesn't match an installed package then build
3.
 
Actual results:
cries like a baby

Expected results:
should talk like a rational toddler at least

Additional info: