trac#225: Report error when no definition in OVAL file.
trac#225: Report error when no definition in OVAL file.

Addressing:
Result: (null)

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