Fix unit tests as blank files can still have blocks
Fix unit tests as blank files can still have blocks

On an encrypted filesystem everything acts like a symlink

$ stat baz
  File: ‘baz’
  Size: 0         	Blocks: 16         IO Block: 4096   regular empty file
Device: 26h/38d	Inode: 6835152     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ posix4e)   Gid: ( 1000/ posix4e)
Access: 2015-07-10 11:11:21.846851777 -0700
Modify: 2015-07-10 11:11:21.846851777 -0700
Change: 2015-07-10 11:11:21.846851777 -0700
 Birth: -

brayniac/nix-rust,diwic/nix-rust,luca-barbieri/nix-rust,posborne/rust-nix,xd009642/nix,MarkusJais/nix-rust,xd009642/nix,Susurrus/nix,mneumann/nix-rust,luca-barbieri/nix-rust,steveklabnik/nix-rust,cmr/nix-rust,berkowski/nix,asomers/nix,danburkert/nix-rust,diwic/nix-rust,marjakm/nix-rust,brayniac/nix-rust,utkarshkukreti/nix-rust,nix-rust/nix,Susurrus/nix,posborne/rust-nix,drewet/nix-rust,tailhook/nix-rust,marjakm/nix-rust,utkarshkukreti/nix-rust,geofft/nix-rust,MarkusJais/nix-rust,tailhook/nix-rust,carllerche/nix-rust,posborne/rust-nix,kamalmarhubi/nix-rust,cysp/nix-rust,kamalmarhubi/nix-rust,nikklassen/nix-rust,danburkert/nix-rust,asomers/nix,diwic/nix-rust,arthurprs/nix-rust,jamwt/nix-rust,luca-barbieri/nix-rust,xd009642/nix,marjakm/nix-rust,tempbottle/nix-rust,geofft/nix-rust,brayniac/nix-rust,nix-rust/nix,steveklabnik/nix-rust,tempbottle/nix-rust,nikklassen/nix-rust,danburkert/nix-rust,cmr/nix-rust,polachok/nix-rust,berkowski/nix,tempbottle/nix-rust,utkarshkukreti/nix-rust,cmr/nix-rust,mneumann/nix-rust,polachok/nix-rust,tailhook/nix-rust,cysp/nix-rust,mneumann/nix-rust,drewet/nix-rust,berkowski/nix,arthurprs/nix-rust,jamwt/nix-rust,arthurprs/nix-rust,geofft/nix-rust,steveklabnik/nix-rust,nikklassen/nix-rust,Susurrus/nix,carllerche/nix-rust,drewet/nix-rust,polachok/nix-rust,kamalmarhubi/nix-rust,jamwt/nix-rust,MarkusJais/nix-rust,cysp/nix-rust,carllerche/nix-rust