fix(ui): source can in fact be undefined
(#20381) (backport for 2.12)
#20420
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undefined
The assumption that a source is always there is not always true. To repro, create an app-of-apps containing a single app without any
source
present. In the UI this will crash, horribly. This PR fixes that so that instead of crashing the user will get useful info indicating what is wrong with the app.chore(ui): some cr tweaks
chore(ui): some cr tweaks
Checklist: