Issue374 documents in activity bug

src/Bundle/ChillActivityBundle/Form/ActivityType.php

@@ -307,6 +307,7 @@ class ActivityType extends AbstractType
                 'allow_add' => true,
                 'button_add_label' => 'activity.Insert a document',
                 'button_remove_label' => 'activity.Remove a document',
+                'empty_collection_explain' => 'No documents',
             ]);
         }