Fixes a bug in DOMImplTrident#getTagName() where it does not handle an undefined scope name.

Patch by: kerjin2001   	
Review by: jlabanca



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@6081 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/dom/client/DOMImplTrident.java b/user/src/com/google/gwt/dom/client/DOMImplTrident.java
index 4bc7ae9..5368da8 100644
--- a/user/src/com/google/gwt/dom/client/DOMImplTrident.java
+++ b/user/src/com/google/gwt/dom/client/DOMImplTrident.java
@@ -203,8 +203,7 @@
     String tagName = getTagNameInternal(elem);
     String scopeName = getScopeNameInternal(elem);
 
-    if ("html".equalsIgnoreCase(scopeName)
-        || "undefined".equalsIgnoreCase(scopeName)) {
+    if ((scopeName == null) || "html".equalsIgnoreCase(scopeName)) {
       return tagName;
     }