Remove empty query from query stats, a=chris

diff --git a/src/views/elements/QuerystatsElement.php b/src/views/elements/QuerystatsElement.php
index daaa4f475..ea288a271 100644
--- a/src/views/elements/QuerystatsElement.php
+++ b/src/views/elements/QuerystatsElement.php
@@ -97,6 +97,9 @@ class QuerystatsElement extends Element
                 $background = "";
                 foreach ($data['STATISTICS'][$time_period] as
                     $item_name => $item_data) {
+                    if (empty(trim($item_name))) {
+                        continue;
+                    }
                     $background = empty($background) ? " class='back-gray' " :
                         "";?>
                     <tr <?=$background ?>>