[bugfix] rollback emoji on failure

cli/uiMessage.js

@@ -103,6 +103,7 @@ var AbstractUiMessage = (function() {
         return formatText(text, {
             highlight: [ "fromage" ],
             emojiFormatFunction: function(emoji) {
+                var emojiSrc = emoji;
                 if (emoji[0] === ':' && emoji[emoji.length -1] === ':')
                     emoji = emoji.substr(1, emoji.length -2);
                 var emojiDom = makeEmojiDom(emoji);
@@ -112,7 +113,7 @@ var AbstractUiMessage = (function() {
                     domParent.appendChild(emojiDom);
                     return domParent.outerHTML;
                 }
-                return emoji;
+                return emojiSrc;
             },
             linkFilter: linkFilter
         });