Do export UNKNOWN result, when @multi-check creates zero rule-results
Do export UNKNOWN result, when @multi-check creates zero rule-results

Another hic-sunt-leones corner-case, this happens when referenced
OVAL file contains no <definition/> elements.

We believe that such case happens only by accident and if
the scanner was creating zero <rule-results/> it would make
the problem only worse and hide the cause.

We like to put the lights on.

postfix/openscap,openprivacy/openscap,OpenSCAP/openscap,redhatrises/openscap,redhatrises/openscap,ybznek/openscap,jan-cerny/openscap,openprivacy/openscap,openprivacy/openscap,ybznek/openscap,postfix/openscap,mpreisler/openscap,isimluk/openscap,jan-cerny/openscap,isimluk/openscap,OpenSCAP/openscap,OpenSCAP/openscap,mpreisler/openscap,mpreisler/openscap,OpenSCAP/openscap,jan-cerny/openscap,Hexadorsimal/openscap,postfix/openscap,Hexadorsimal/openscap,ybznek/openscap,Hexadorsimal/openscap,ybznek/openscap,OpenSCAP/openscap,openprivacy/openscap,openprivacy/openscap,Hexadorsimal/openscap,redhatrises/openscap,postfix/openscap,mpreisler/openscap,isimluk/openscap,redhatrises/openscap,redhatrises/openscap,isimluk/openscap,openprivacy/openscap,Hexadorsimal/openscap,mpreisler/openscap,jan-cerny/openscap,isimluk/openscap,postfix/openscap,isimluk/openscap,ybznek/openscap,redhatrises/openscap,postfix/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,jan-cerny/openscap,ybznek/openscap,jan-cerny/openscap,mpreisler/openscap