Fix nil pointer dereference in sub/scanner.ScanFileSystem().
Fix nil pointer dereference in sub/scanner.ScanFileSystem().

rgooch/Dominator,rgooch/Dominator,Symantec/Dominator,Symantec/Dominator,Symantec/Dominator,rgooch/Dominator,keep94/Dominator,keep94/Dominator,keep94/Dominator