Clean the value on saving of the setting

app/Http/Controllers/Admin/SettingsController.php

@@ -172,6 +172,10 @@ class SettingsController extends AbstractController
 
         try {
             foreach (Binput::except(['app_banner', 'remove_banner']) as $settingName => $settingValue) {
+                if ($settingName === 'app_analytics_pi_url') {
+                    $settingValue = rtrim($settingValue, '/');
+                }
+
                 Setting::firstOrCreate([
                     'name' => $settingName,
                 ])->update([

resources/views/partials/analytics.blade.php

@@ -18,7 +18,7 @@
   _gs('{{ $gosquaredTracking }}');
 </script>
 @endif
-@if($piwikTracking = rtrim(Setting::get('app_analytics_pi_url'), '/'))
+@if($piwikTracking = Setting::get('app_analytics_pi_url'))
 <!-- Piwik -->
 <script type="text/javascript">
   var _paq = _paq || [];