API: Not implemented stuff should return 404

include/api.php

@@ -386,7 +386,7 @@ function api_call(App $a, App\Arguments $args = null)
 		}
 
 		Logger::warning(API_LOG_PREFIX . 'not implemented', ['module' => 'api', 'action' => 'call', 'query' => DI::args()->getQueryString()]);
-		throw new NotImplementedException();
+		throw new NotFoundException();
 	} catch (HTTPException $e) {
 		header("HTTP/1.1 {$e->getCode()} {$e->httpdesc}");
 		return api_error($type, $e, $args);