Rather than the 'Rules' text being blank when someone creates a new community, how about adding this text by default?
'See the Okuna Community Guidelines in your in-app useful links.'
The moderator can choose to delete it if they don't feel it needs repeating for their particular community, then add their own text. Or they can include it with their own text. But many may not bother writing 'Rules' so, if they don't, at least it's a reminder of our general do and don't.