https://bugzilla.novell.com/show_bug.cgi?id=160330

This patch prevents the parser from segv'ing if neither of the expected
default profile directories exist (/etc/subdomain.d, /etc/apparmor.d).
A profile passed on the command line or via stdin will still load, so
long as -I/path/to/includes is passed for any relevant includes files.

parser/parser_include.c

@@ -191,7 +191,7 @@ int add_search_dir(char *dir)
 		return 0;
 	}
 
-	if (strlen(dir) <= 0)
+	if (!dir || strlen(dir) <= 0)
 		return 1;
 
 	t = malloc(strlen(dir) + 1);