[CentOS] CentOS 7 + HPLIP = blank page

> PS: on a side note, I wanted to discuss this subject on the CentOS Facebook group,
>  but got blocked by their admin who seems to be the local pet autocrat.

Try centos.org/forums instead. 

I tend to avoid wiki sites to which I'm not allowed to contribute; maybe you'd feel like jumping through their hoops, though.
i.e. see item 3 at wiki.centos.org/Contribute