Description of problem:
satellite-branding package does not compound logo.png, which is included
in spacewalk-branding. This image is needed by some of the error pages.
It's non-existence results in 

    [error] File does not exist: /var/www/html/img/logo.png

The problem is revealed whenever the error pages is rendered.

Version-Release number of selected component (if applicable):
satellite-branding-5.4.0.10-1.el6sat.noarch

Additional info:
In Spacewalk there are three logos:

  logo_product.png - The caption 'Spacewalk'
  logo_vendor.png - That small Space-man
  logo.png - The caption together with that small Space-man

In the Satellite, the equivalent of the last one is missing.