`Nav::renderItem()` adjusted

CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 bootstrap extension Change Log
 2.0.6 under development
 -----------------------
 
+- Bug #68: Fixed `yii\bootstrap\Nav` handling empty items (freezy-sk)
 - Bug #81: Fixed `yii\bootstrap\ActiveField::radioList()` and `yii\bootstrap\ActiveField::checkboxList()` ignore `itemOptions` (mikehaertl)
 - Bug #98: Fixed `yii\bootstrap\ButtonDropdown` setting `href` attribute for non `a` tags (13nightevil)
 - Enh #45: Added support for Bootstrap checkbox/radio toggle buttons (RomeroMsk, klimov-paul)

Nav.php

@@ -177,7 +177,9 @@ class Nav extends Widget
             $active = $this->isItemActive($item);
         }
 
-        if (!empty($items)) {
+        if (empty($items)) {
+            $items = '';
+        } else {
             $linkOptions['data-toggle'] = 'dropdown';
             Html::addCssClass($options, ['widget' => 'dropdown']);
             Html::addCssClass($linkOptions, ['widget' => 'dropdown-toggle']);
@@ -192,10 +194,6 @@ class Nav extends Widget
             }
         }
 
-        if (empty($items)) {
-            $items = '';
-        }
-
         if ($this->activateItems && $active) {
             Html::addCssClass($options, 'active');
         }