Worked on RG-156

CRM/Grant/PaymentTask.php

@@ -149,6 +149,13 @@ class CRM_Grant_PaymentTask {
    * @access public
    */
   static function getTask($value) {
+    self::tasks();
+    if (! $value || ! CRM_Utils_Array::value($value, self::$_tasks)) {
+      // make the print task by default
+      $value = '5';
+    }
+    return array(self::$_tasks[$value]['class'],
+             self::$_tasks[$value]['result']); 
   }
 }
 

CRM/Grant/StateMachine/PaymentSearch.php

@@ -94,7 +94,7 @@ class CRM_Grant_StateMachine_PaymentSearch extends CRM_Core_StateMachine {
     }
     $this->_controller->set('task', $value);
         
-    return CRM_Grant_PaymentTask::getTask($value);  
+    return !empty($value) ? CRM_Grant_PaymentTask::getTask($value) : CRM_Core_DAO::$_nullArray;  
   }
     
   /**