The 'Your generosity humbles me!' dockscreen shows a blank list of actions.
Clicking the blank button or pressing Enter works fine and you'll return to the Infirmary dockscreen.

nms 31 Jul 2017:

For more details, see also medical CSC needs text id 1.8a2

george moromisato 14 Sep 2017:

Fixed in 1.8 Alpha 3. Thanks!