Files App: No decimal points for kB and Byte and blocking uploading files of the size zro

The first issue is #5604: The IE 10 can't upload files of the size zero. Therefore, block uploading files of the size of zero from all Browsers.

The second Issue #5371:  The human readable size information shouldn't round by kB and Byte. My approach was to change the rounding settings the humanFileSize function (JS and PHP).

I hope the provided solutions are helpful.