Fixes unit test regression introduced in 0eb17558d13723f5926dc5639ce1c8686bb2ba3d
Since file size is required attribute it has to be specified

Target: 2.2
Require-book: no
Require-notes: no
Merge pull request #640 from DmitryLitvintsev/fix/2.2/pinstaged1

Fix/2.2/pinstaged1