ViewPhoto: simplify filter verification

models/Asset.php

@@ -723,9 +723,8 @@ class Asset
 		}
 
 		// Take active filter into account as well
-		if (!empty($activeFilter))
+		if (!empty($activeFilter) && ($user = Member::fromSlug($activeFilter)) !== false)
 		{
-			$user = Member::fromSlug($activeFilter);
 			$where[] = 'id_user_uploaded = {int:id_user_uploaded}';
 			$params['id_user_uploaded'] = $user->getUserId();
 		}

models/User.php

@@ -75,6 +75,11 @@ abstract class User
 		return $this->ip_address;
 	}
 
+	public function getSlug()
+	{
+		return $this->slug;
+	}
+
 	/**
 	 * Returns whether user is logged in.
 	 */