Bugfix. Clicking emoji category twice closes picker and inserts null

src/converse-emoji-views.js

@@ -142,7 +142,7 @@ converse.plugins.add('converse-emoji-views', {
             events: {
                 'click .emoji-picker__header li.emoji-category': 'chooseCategory',
                 'click .emoji-skintone-picker li.emoji-skintone': 'chooseSkinTone',
-                'click .toggle-smiley ul.emoji-picker li': 'insertEmoji',
+                'click .insert-emoji': 'insertEmoji',
                 'keydown .emoji-search': 'onKeyDown'
             },