Moved issue richardgirges#14 check to fileFactory

lib/processMultipart.js

@@ -46,19 +46,11 @@ module.exports = (options, req, res, next) => {
     file.on('data', dataHandler);
 
     file.on('end', () => {
-      const buffer = complete(filename);
-      // see: https://github.com/richardgirges/express-fileupload/issues/14
-      // firefox uploads empty file in case of cache miss when f5ing page.
-      // resulting in unexpected behavior. if there is no file data, the file is invalid.
-      if (!buffer.length && !options.useTempFiles) {
-        return;
-      }
-
       // Add file instance to the req.files
       req.files = buildFields(req.files, fieldname, fileFactory(
         {
+          buffer: complete(),
           name: parseFileName(options, filename),
-          buffer,
           tempFilePath: getFilePath(),
           size: getFileSize(),
           hash: getHash(),
@@ -69,7 +61,7 @@ module.exports = (options, req, res, next) => {
         options
       ));
     });
-
+    
     file.on('error', cleanup, next);
   });