LPS-42862 CMD could be send as part of the URL. In this case it will not be null so logic will not check if the upload servlet has introduced a fileSizeError
LPS-42862 If the file is been created using multiple upload the defaultErrorMessage should be hidden
LPS-42862 Create a new convenience method to hide the default error message
LPS-42862 Remove Validator.isNull(cmd) from handleUploadException too