GetBoundingBox now returns 0 for w and h when the string is empty.

git-svn-id: http://root.cern.ch/svn/root/trunk@40469 27541ba8-7e3a-0410-8455-c3a389f83636

graf2d/doc/v532/index.html

@@ -24,4 +24,11 @@
    <img alt="The new option E5" src="e5.gif"/>
    </center>
 </li>
-</ul>
\ No newline at end of file
+</ul>
+
+<h4>TText</h4>
+<ul>
+<li> <tt>TText::GetBoundingBox</tt> now returns 0 when the string is empty. Previously it returned
+undefined numbers.
+</li>
+</ul>