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Description of the change
This PR hides the LoadingWrapper when it has finished the fetching and there is an error (it was leading to a bug reported at #4960). Besides, I've updated the test suite to set the state types so that we can get earlier feedback at build (aka transpile) time.
Benefits
No more endless spinner when loading an installed package that doesn't exist. Instead, an error message will be thrown, and the user will be able to go to the apps view.
Possible drawbacks
N/A
Applicable issues
Additional information