[sdk] Not consistent empty state design across the platform

[Stefano Verzegnassi]

Having a look at the design of the empty state in several core apps, I found we don't have a unique design.

In particular I found 5 different versions:
1) clock-app - used by docviewer, calculator
2) dekko - similar to clock-app, but bigger image
3) messages-app - smaller image, bigger text
4) dialer-app - just text
5) music-app
6) system-settings - Updates - only text "Software is up to date" is displayed: https://wiki.ubuntu.com/SoftwareUpdates#presenting-individual

Currently, docviewer - which uses the design 1) - shows an empty state when no document is available. For the same situation, music-app uses a different design.

Since clock-app design has been released in Sep '14, and music-app design in Jan '15, which design should we follow?

Below I've attached some screenshot.

[Jenkins Bot (ubuntu-core-apps-jenkins-bot)]

Fix committed into lp:ubuntu-docviewer-app at revision 232, scheduled for release in ubuntu-docviewer-app, milestone ww02-2016

[Femma (femma)]

This is currently a project on the backlog, this issue will be addressed as part of that.

[Vesa Rautiainen (vesar)]

When designing this please try to consider empty app switcher use case as well. That is when there are no apps open.