MonitoredObjectController: history only if available

modules/monitoring/library/Monitoring/Web/Controller/MonitoredObjectController.php

@@ -212,15 +212,17 @@ abstract class MonitoredObjectController extends Controller
                 'urlParams' => $params
             )
         );
-        $tabs->add(
+        if ($this->backend->hasQuery('eventHistory')) {
-            'history',
+            $tabs->add(
-            array(
+                'history',
-                'title'     => 'History',
+                array(
-                'icon'      => 'rewind',
+                    'title'     => 'History',
-                'url'       => 'monitoring/show/history',
+                    'icon'      => 'rewind',
-                'urlParams' => $params
+                    'url'       => 'monitoring/show/history',
-            )
+                    'urlParams' => $params
-        );
+                )
+            );
+        }
         $tabs
             ->extend(new OutputFormat())
             ->extend(new DashboardAction());