Remove try/catch as Scott changed the implementation so that it returns nothing instead of throwing r=Mnyromyr

mailnews/base/prefs/resources/content/pref-labels.js

@@ -338,12 +338,8 @@ function OnOK()
       {
         // newly added tag, need to create a key and read it
         tagService.addTag(tagInfo.tag, '', '');
-        try
-        {
         tagInfo.key = tagService.getKeyForTag(tagInfo.tag);
       }
-        catch (e) {}
-      }
 
       if (tagInfo.key)
       {