Fix null reference exception if SDK is located inside the wixlocation folder
Fix null reference exception if SDK is located inside the wixlocation folder

oleg-shilo/wixsharp,dguder/wixsharp,dguder/wixsharp,oleg-shilo/wixsharp,oleg-shilo/wixsharp,oleg-shilo/wixsharp,oleg-shilo/wixsharp