Navigation: Add method hasRenderableItems()

refs #5600

library/Icinga/Web/Navigation/Navigation.php

@@ -263,6 +263,22 @@ class Navigation implements ArrayAccess, Countable, IteratorAggregate
         return empty($this->items);
     }
 
+    /**
+     * Return whether this navigation has any renderable items
+     *
+     * @return  bool
+     */
+    public function hasRenderableItems()
+    {
+        foreach ($this->getItems() as $item) {
+            if ($item->shouldRender()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * Return this navigation's layout
      *

modules/monitoring/application/views/scripts/show/components/actions.phtml

@@ -27,7 +27,7 @@ if (isset($this->actions)) {
     }
 }
 
-if ($navigation->isEmpty()) {
+if ($navigation->isEmpty() || !$navigation->hasRenderableItems()) {
     return;
 }
 

modules/monitoring/application/views/scripts/show/components/notes.phtml

@@ -32,7 +32,7 @@ if (! empty($links)) {
     }
 }
 
-if ($navigation->isEmpty()) {
+if ($navigation->isEmpty() || !$navigation->hasRenderableItems()) {
     return;
 }
 ?>