This edge case is possible: a user chooses a suggested article from the feed, but then there is not actually any suggestions available when they arrive on the article, either because the article already has an image or because the suggested image is no longer available. This can happen because another user has added the image since the feed was refreshed, among other reasons.
In this case:
- The user should see a simple error dialog.
- It should say, "Suggestion no longer available on this article."
- The button should say, "Back to suggested edits"
- The button should go back to the suggested edits module on mobile (back to the homepage on desktop in future iterations).
This is similar to the dialog shown for the Add a link task in T277508.
