Dont update favorites if there aren't any

boards/static/js/main.js

@@ -93,19 +93,22 b' function updateFavPosts() {'
 
 function initFavPanel() {
     updateFavPosts();
-    setInterval(updateFavPosts, FAV_POST_UPDATE_PERIOD);
-    $('#fav-panel-btn').click(function() {
-        $('#fav-panel').toggle();
-        updateFavPosts();
+
+    if ($('#fav-panel-btn').length > 0) {
+        setInterval(updateFavPosts, FAV_POST_UPDATE_PERIOD);
+        $('#fav-panel-btn').click(function() {
+            $('#fav-panel').toggle();
+            updateFavPosts();
 
-        return false;
-    });
+            return false;
+        });
 
-    $(document).on('keyup.removepic', function(e) {
-        if(e.which === 27) {
-            $('#fav-panel').hide();
-        }
-    });
+        $(document).on('keyup.removepic', function(e) {
+            if(e.which === 27) {
+                $('#fav-panel').hide();
+            }
+        });
+    }
 }
 
 $( document ).ready(function() {