In Moodle 3.1.5, the attendance feature of the Face-to-face plugin cannot mark users as "No show". When clicking on "Take attendance", I try to change any user to "No show" and click save, it will then revert back to the previous state once the page reloads. Fully attended and Partially attended options save without any issue.
any chance you guys could file a pull request with your changes here? - we've done some more recent work on the plugin to tidy up the branches etc.
looks like you used the 2.9dev branch which was an "alpha" release and wasn't well tested rather than the master branch to base your work off. unfortunately that work isn't in the newer master branch.