This release fixes the testing channel. Users who want to use the testing channel should install this update, switch to the testing channel if they haven't yet, restart OctoPrint if it did not restart automatically and then check for updates again (ignore cache if necessary), which should then show the 1.8.0a1 testing release.
If you don't want to use the testing channel or if you do not know what that is, you can install this update or not, it will not change anything.