fixup: emit error on key missing instead of next

Author: Will Toozs

lib/api/api.js

@@ -227,8 +227,10 @@ const api = {
                         if ('key' in request.formData) {
                             return next(null);
                         }
-                        return next(errors.InvalidArgument.customizeDescription('Bucket POST must contain'
-                            + " a field named 'key'.  If it is specified, please check the order of the fields."));
+
+                        const err = errors.InvalidArgument.customizeDescription('Bucket POST must contain'
+                            + " a field named 'key'.  If it is specified, please check the order of the fields.");
+                        formDataParser.emit('error', err);
                     });
                     formDataParser.on('finish', () => {
                         // No file field == error