Fixing a minor issue in FileSystemFilter which prevented some external files from being loaded. Thanks to Jonathan Klein to point it out.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@399 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/FileSystemFilter.h

@@ -71,7 +71,7 @@ public:
 		}
 		else {
 			base = "";
-			return;
+		//	return;
 		}
 
 		// make sure the directory is terminated properly