"No screenshot available" should lead to screenshot upload page

[anatoly techtonik]

UI should encourage users to upload package screenshots.
When there is no screenshot, a link should be generated
to upload interface. I believe here it is, but I am not sure:

http://screenshots.debian.net/upload

Please confirm if you know.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: software-center 13.10-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
Date: Wed Dec 25 16:46:18 2013
InstallationDate: Installed on 2012-03-12 (653 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: software-center
UpgradeStatus: Upgraded to saucy on 2013-10-21 (65 days ago)