Only allow the user to add apps that do not exist in the repo
If an app with the same package ID already exists in the repo,
it will still be shown, but the Add
button will be disabled
and show Added
instead.
Closes #93 (closed)
If an app with the same package ID already exists in the repo,
it will still be shown, but the Add
button will be disabled
and show Added
instead.
Closes #93 (closed)