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trigger an action when text field is emptied

jcm69 , September 08 2017
the default value of the text field is None.
I've created an Event that displays a button when the default value is changed.
But I want to hide this button is the field is emptied afterwards...
I thought about creating an new Event activated when the field is empty but how to specify an empty string in the Value(s) field of the event ?
Thanks in advance,