fix php notice if arg 1 not exist

Author: seyfer

php/emit_log_direct.php

@@ -9,8 +9,7 @@
 
 $channel->exchange_declare('direct_logs', 'direct', false, false, false);
 
-$severity = $argv[1];
-if(empty($severity)) $severity = "info";
+$severity = isset($argv[1]) && !empty($argv[1]) ? $argv[1] : 'info';
 
 $data = implode(' ', array_slice($argv, 2));
 if(empty($data)) $data = "Hello World!";