Behavior when the condition in conditional format is cleared

[thorsten.langner]

This is the same issue as I described on “empty” filters here:

Problem: One table filter doesn't work

Hi @JoelBGT here comes the reason and the workaround Reason: The Filters on Text type columns find all, if the variables value is ‘null’ The Value of a text variable is not ‘null’ , but an empty string, if you “clear” the text input (using your keyboard). Unfortunately that means, all rows with ‘null’ in this column, will be hidden (also on the other filters you have, if any of these values is ‘null’ it will disappear Unfortunately the X Clear Input button also doesn’t clea…

The X does make an empty string and not a null value.
Any text will also contain an empty string, if you will…but null values don’t.