ZF-8602

- Ensures that a constant is defined before calling constant() on the value, tests pass fully now

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@20260 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Log/Filter/Priority.php

@@ -78,7 +78,7 @@ class Zend_Log_Filter_Priority extends Zend_Log_Filter_Abstract
         ), $config);
 
         // Add support for constants
-        if (!is_numeric($config['priority'])) {
+        if (!is_numeric($config['priority']) && isset($config['priority']) && defined($config['priority'])) {
             $config['priority'] = constant($config['priority']);
         }