I have been trying to figure out which layer/.phtml/extension is responsible for the empty
alt="" in the enlarged images on a site, for example at
The idea is to default to a product or category name when an label is empty. Being somewhat new, I have poured through guides and followed changes in code from related examples, to no avail. Even after I manually refresh some caches (is that necessary?) and rebuild indexes, an F12 element inspection of the resulting HTML in the browser shows a blank alt= value, which affects web crawlers.
https://github.com/adampmoss/CreareSEO had been installed, but does not enforce
Make "alt" tags mandatory on product gallery images?
(only temporarily as in this screenshot)
What other files, templates, extensions or settings should I look into?
These two didn't help: