Exceptions in Firefox are slow. (The costs of the lovely exception.stack,

most likely.) Don't depend on exceptions for parsing XML, then: instead, use
an if/else. 3x speed up of WMC parsing in FF. r=ahocevar (Closes #1642) 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@7870 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/XML.js

@@ -290,9 +290,9 @@ OpenLayers.Format.XML = OpenLayers.Class(OpenLayers.Format, {
      */
     getChildValue: function(node, def) {
         var value;
-        try {
+        if (node && node.firstChild && node.firstChild.nodeValue) { 
             value = node.firstChild.nodeValue;
-        } catch(e) {
+        } else {
             value = (def != undefined) ? def : "";
         }
         return value;