Software Center misleading tooltip for certain apps

[DavidePrincipi]

If the repository metadata of a certain application contains only "testing":true versions, the Software Center displays it with a misleading tooltip, Update to core version 0.0.0...

Steps to reproduce

• Enable Martin's custom repository at https://raw.githubusercontent.com/geniusdynamics/ns8-genforge/repomd/ns8/updates/
• Navigate to Software Center
• Look at Rally app

Expected behavior

The app should be not listed, or a tooltip should explain that it cannot be installed because no stable versions are available.

Actual behavior

The app is listed, Install button is disabled, and its tooltip says "Update to core version 0.0.0..." which is quite misleading for the user.

Components

Core 3.4.0

See also

https://community.nethserver.org/t/app-install-via-softwarecenter-not-possible/25090/

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Thanks to MrMarkuz