Required field in "prompt for user input"?

Is there any way to have certain fields be "required" with the "prompt for user input" action? Basically I'd like the OK button to be greyed out if certain fields are blank. I don't want any empty-string variables!! (and my right pinky loves to hit the return key when it's not supposed to)

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Short answer: Nope

The workaround is to put the prompt in a While action or Until action loop checking the KM variable of interest.

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ok! Doesn't seem like too bad of a workaround. Thanks for the quick reply!