This is a very crude way of redirecting to google, but in /etc/dansguardian-av/dansguardian.conf you can set
accessdeniedaddress = http://www.google.com
Copy and paste the original parameter line and comment out the original line with # in order to return to what you had if you don't like the results.
By default the reporting level in dansguardian.conf should be set for 2, but if it's not then it will have to be in order for denied sites to be redirected to this crude google page (crude meaning botched looking).
You'll have to restart the service for this to work.
service dansguardian restart