File upload does not work correctly with empty files (file size = 0)

The file upload is started but only executes a HIL_FILE_UPLOAD_REQ request. A HIL_FILE_UPLOAD_DATA_REQ is not executed because the received file length is checked and if it is 0, the
HIL_FILE_UPLOAD_DATA_REQ  is skipped.
This leaves the Firmware / Middleware upload function in an active state.
All further File-related requests will return ERR_HIL_RESOURCE_IN_USE (0xC0001002) until an HIL_FILE_UPLOAD_ABORT_REQ is sent to the Middleware.

Note:
Using the cifX toolkit functions xSysdeviceUpload() / xChannelUpload(), each 2nd call to the functions will return with the error ERR_HIL_RESOURCE_IN_USE but than, an internal
HIL_FILE_UPLOAD_ABORT_REQ is also send to the device and the next file related command will work again (see code for DEV_UploadFile() in cifXDownload.c).