[common] debug: fix segfault when the PSTRIP env. var is not defined
[common] debug: fix segfault when the PSTRIP env. var is not defined

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