Proper fallback from referer to REQUEST_URI
    
    If the referer is present but does not contain a transaction ID we still
    need to fallback to the REQUEST_URI. Fix the code to check the url and
    then fallback to REQUEST_URI rathe than decide upfront merely on the
    fact a referer is available.
    
    https://fedorahosted.org/ipsilon/ticket/74
    
    Signed-off-by: Simo Sorce <simo@redhat.com>
    Reviewed-by: Nathan Kinder <nkinder@redhat.com>