Comment 9 for bug 1631806

The 15.10 patch is slightly different to the others.

in 16.04+ we can check using the SITE_TEMPLATE constant, but that didn't exist in 15.10

instead we need to check if $template->get('owner') === '0' as it seems that fetching the variable from db via get() method make it type string.

But we can't go (int) $template->get('owner') as both '0' and null will be cast to 0