Add isPublic filter on entries

src/Wallabag/CoreBundle/Entity/Entry.php

@@ -684,6 +684,16 @@ class Entry
         $this->uid = null;
     }
 
+    /**
+     * Used in the entries filter so it's more explicit for the end user than the uid.
+     *
+     * @return bool
+     */
+    public function isPublic()
+    {
+        return null !== $this->uid;
+    }
+
     /**
      * @return string
      */