How to close "alert" window by shortcuts

Hi

I'm using the latest IDEA 2019.2. Please help me with closing alter popup by shortcuts.

For example, when I press command+K when there's no change, an alert popup will show tells me no change to commit with a highlight OK button. I tried some ways to close the popup by press keys, including Enter, alt Enter, ctrl Enter, shift Enter or Esc. None of them worked. And I searched but didn't get any answer. I also tried to cancel all binding with ctrl + enter, then not working.

Please tell me a way to close an alter popup, thank you very much