Zero-length files not accepted

[jcdr428]

When the .torrent includes zero-length files, these files are not included in the files list; the file list is not shown in the UI 'Files' tab; when unchecking files (i.e. file_priorites = 0), the wrong files are downloaded.

Empty files are not forbidden in the bittorrent specs.

Example of non-working .torrent:

d8:announce19:http://announce.com4:infod5:filesld6:lengthi0e4:pathl13:EmptyFile.txteed6:lengthi1000e4:pathl16:NonEmptyFile.txteee4:name11:TorrentFile12:piece lengthi16384e6:pieces20:ABCDEFGHIJKLMNOPQRST7:privatei0e6:source6:sourceee

[jcdr428]

Edit: My hint is this may come from size == 0 (therefore pos >= size) in 'metafile.py' line 353:

        with open(f, 'rb') as file_:
            while pos < size: