Empty state
Empty or error states are very often underestimated part of the application. But why? Just imagine the situation where you are searching for something or trying to set up your new profile and suddenly you see an empty screen without any explanation. What will happen? Your application will lose the user trust or worse you will lose user if he/she is just evaluating your app. So make sure you will provide a clear message of what happened, why and what needs to be done to solve the issue. Ideally in human-readable format :-P
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