system.findstr and matchuserdata no longer throw exceptions for undef 2nd arg

these functions just return the 'not found' equivalent return type when passed
null or undefined for the search string.

exec/tests/system/except.js

@@ -12,14 +12,14 @@ var func_list = {
 	'exec': 1,
 	'filter_ip': 1,
 	'find_login_id': 0,
-	'findstr': 2,
+	'findstr': 1,
 	'get_node': 1,
 	'get_node_message': 1,
 	'get_telegram': 1,
 	'hacklog': 1,
 	'illegal_filename': 0,
 	'matchuser': 0,
-	'matchuserdata': 2,
+	'matchuserdata': 1,
 	'new_user': 1,
 	'notify': 2,
 	'popen': 1,