No indication that is mandatory have at least one character in filter field

[rodmatola]

After filtering, since there's no indication how to come back to the full list, one option is to click "search" button with empty field. This action leads to a message to fill the field.

Suggestion: put a star or a message to indicate that you must fill something in this field. Also put a minimum number of characters to perform a search, otherwise will have a lot o occurrencies.