ECLPlayground: IE7 + IE8 Loading Issue.

Page failed to load while initialising the target drop down box.

Fixes gh-2821

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>

esp/files/ECLPlayground.js

@@ -155,7 +155,8 @@ define([
 			},
 
 			initTargets = function () {
-				var base = new ESPBase();
+				var base = new ESPBase({
+				});
 				var request = {
 					rawxml_: true
 				};