When I was still a fully paid up member, a dear friend of mine used to email me straight away if we missed any meetings and say she missed us. It used to bug me no end as it always made me feel so uncomfortable especially as my excuses sounded so pathetic. Time over again I would've said "yeah, we missed you too, but we sure didn't miss the meeting!!!".
Still, I think it is simply code for "hey, we missed you suffering alongside us. Please make sure you're at the next one to join us in our misery!"