Index: tests/Zend/Filter/InputTest.php
===================================================================
--- tests/Zend/Filter/InputTest.php	(revision 24388)
+++ tests/Zend/Filter/InputTest.php	(working copy)
@@ -81,6 +81,27 @@
     
     /**
      * 
+     * Empty arrays should be considered as not valid with NotEmpty.
+     * 
+     */
+    function testNotEmptyValidatorWithEmptyArray()
+    {
+        require_once 'Zend/Filter/Input.php';
+        
+        $validators = array(
+            'test' => array()
+        );
+        
+        $data = array(
+            'test' => array()
+        );
+        
+        $input = new Zend_Filter_Input(null, $validators, $data);
+        $this->assertFalse($input->isValid());
+    }
+    
+    /**
+     * 
      * If setAllowEmpty(true) is called, all fields are optional, but fields with
      * a NotEmpty validator attached to them, should contain a non empty value.
      * 
Index: library/Zend/Filter/Input.php
===================================================================
--- library/Zend/Filter/Input.php	(revision 24388)
+++ library/Zend/Filter/Input.php	(working copy)
@@ -1056,7 +1056,7 @@
             $field     = reset($data);
 
             $failed = false;
-            if (!is_array($field)) {
+            if (!is_array($field) || empty($field)) {
                 $field = array($field);
             }