fixup: api: add fileevent check for no file data

Author: Will Toozs

lib/api/api.js

@@ -247,7 +247,9 @@ const api = {
                             return next(errors.InvalidRequest);
                         }
                         // if fields are found but no file, continue
-                        return next(null);
+                        if (!fileEventData) {
+                            return next(null);
+                        }
                     });
 
                     bb.on('error', (err) => {