Return false for null entities when propagating changes to activites #1069

Closing #1069 (closed)

@markeharding what are your thoughts?

This is the error in Sentry

https://sentry.io/organizations/minds-inc/issues/1740078182/?environment=production&project=1538020&project=1538008&project=1766867&query=is%3Aunresolved+user.id%3A928140507236802565&statsPeriod=14d

I've no idea if it affects other blogs or is a testing artifact, but I also don't see too much harm in checking whether anything is returned by that function.