Immediate feedback behaviours should not show a disabled check button when you can't use it

Create a multiple choice question. Make sure that, among other settings, you add a couple of hints. Preview the question. Restart the preview in Immediate feedback behaviour. Without selecting any choices, click Check. Verify you see a validation message, and the Check button is stil present. Now select a choice and click Check. Verify the feedback is shown (depending on the review options at the bottom of the preview pop-up) but that the Check button is no longer shown. Restart the preview using Interactive with multiple tries behaviour. Select the wrong choice and click check. Verify that the question is shown with some feedback and a Try again button, but that the Check button is not shown. Click Try again. Verify that the Try again button is not shown, but the Check button is. Get the question right, and click Check. Verify that neither button is shown.