Little fix when $output has not defined such as a normal terminal env like jenkins job execution.

workflow/engine/bin/tasks/cliCommon.php

@@ -27,7 +27,7 @@
 
 /* Get the size of the terminal (only works on Linux, on Windows it's always 80) */
 preg_match_all("/rows.([0-9]+);.columns.([0-9]+);/", strtolower(exec('stty -a |grep columns')), $output);
-if(sizeof($output) == 3) { 
+if(sizeof($output) == 3 && isset($output[2]) && isset($output[2][0])) {
   define("COLUMNS", $output[2][0]);
 } else {
   define("COLUMNS", 80);