add test for the last Dmitry's fix

Zend/tests/foreach_undefined.phpt

@@ -0,0 +1,14 @@
+--TEST--
+foreach() & undefined var
+--FILE--
+<?php
+
+foreach($a as $val);
+
+echo "Done\n";
+?>
+--EXPECTF--	
+Notice: Undefined variable: a in %s on line %d
+
+Warning: Invalid argument supplied for foreach() in %s on line %d
+Done