site shouldn't break when wp-cache is misconfigured

[Denis-de-Bernardy]

In wp-settings, the following is called if the wp-config.php defines 'WP_CACHE':

require (ABSPATH . 'wp-content/advanced-cache.php');

When WP-Cache is misconfigured, e.g. the symblink is not created for any reason, this breaks the site.

We could safely replace this with:

@include (ABSPATH . 'wp-content/advanced-cache.php');

D.

+1.

(In [5491]) Don't fail when the user don't set WP-Cache up correctly. Props Denis de Bernardy. fixes #4293