[Bug] No notifications on failures or errors

[armond-avanes]

For example when "too many requests" error is returned from Docker Hub when WUD checks for new Docker image versions, it doesn't post any notification (Apprise trigger in my case) and unless I go check the Docker container logs (or open the WUD web UI and check each container), I won't notice that something has gone wrong.

I'm also a WatchTower user (well, trying to switch to WUD but I still have both running side by side) and it does notify me of any error when trying to check for new versions or to do the actual image update.