Bug 371647 ConvertToUnicode in mailWidgets.xml fails at initializing the notification r+sr=mscott

mailnews/base/resources/content/mailWidgets.xml

@@ -2116,7 +2116,15 @@
                 var previewText = msgHdr.getStringProperty('preview');
                 // convert the preview text from utf-8 to unicode
                 if (previewText)
-                  msgPopup.setAttribute('previewText', unicodeConverter.ConvertToUnicode(previewText));
+                {
+                  try
+                  {
+                    var text = unicodeConverter.ConvertToUnicode(previewText);
+                    if (text)
+                      msgPopup.setAttribute('previewText', text);
+                  }
+                  catch (ex) { }
+                }
 
                 var names = {};
                 var emails = {};