fix bug that would only return error responses for 3rdparty apps

lib/api.php

@@ -147,6 +147,7 @@ class OC_API {
 				}
 			}
 		}
+
 		// Remove any error responses if there is one shipped response that succeeded
 		if(!empty($shipped['succeeded'])) {
 			$responses = array_merge($shipped['succeeded'], $thirdparty['succeeded']);
@@ -157,14 +158,17 @@ class OC_API {
 			// Maybe any that are not OC_API::RESPOND_SERVER_ERROR
 			$response = reset($shipped['failed']);
 			return $response;
-		} else {
+		} elseif(!empty($thirdparty['failed'])) {
 			// Return the third party failure result
 			$response = reset($thirdparty['failed']);
 			return $response;
+		} else {
+			$responses = array_merge($shipped['succeeded'], $thirdparty['succeeded']);
 		}
 		// Merge the successful responses
 		$meta = array();
 		$data = array();
+
 		foreach($responses as $app => $response) {
 			if(OC_App::isShipped($app)) {
 				$data = array_merge_recursive($response->getData(), $data);