Ok, so I've been dealing with this, every Google app update, since.
If I get a Google app update, the Google girl, manual search and Discover page all quit functioning.
The easiest fix I've found is to reboot into SAFE MODE, check that the Google app works and then reboot into regular mode. All things Google then work. Go figure.
THEN, I have to reinstall my Samsung theme, because it's gone; uninstall and reinstall all things in Swift Installer; reset widgets, because they are there, but blank and cannot be awakened. The easiest way I've found to setup the widgets again, is by restoring my Nova Launcher backup.