Simplified the _xccdf_session_export_oval_result_file filename logic
Simplified the _xccdf_session_export_oval_result_file filename logic

We explicitly fail when oval_session has a NULL filename, previously we
would mangle up a nonsensical destination file based on the '(none)'
string.

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