[BUGFIX] t3lib_extjs_ExtDirectDebug::__destruct() missing

In the Developer Logs there are complaints about the missing destructor.
Fix: add it.

Change-Id: I42595a7ebbc3c941bf64bc0699ff908059c107bb
Resolves: #25278
Reviewed-on: http://review.typo3.org/1092
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Oliver Klee
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer

t3lib/extjs/class.t3lib_extjs_extdirectdebug.php

@@ -39,6 +39,22 @@ class t3lib_extjs_ExtDirectDebug {
 	 */
 	protected $debugMessages = array();
 
+
+	/**
+	 * destructor
+	 *
+	 * Currently empty, but automatically registered and called during
+	 * ExtDirect shutdown.
+	 *
+	 * @see http://bugs.typo3.org/view.php?id=17891
+	 * @see http://forge.typo3.org/issues/25278
+	 */
+	public function __destruct() {
+
+	/* currently empty */
+	}
+
+
 	/**
 	 * Adds a new message of any data type to the internal debug message array.
 	 *