Fix subscription page for members of a group

For a member of a group LimitationsManager.userHasSubscriptionOrIsGroupMember
doesn't return any subscription, so when the controller tries to
access subscription.recurlySubscription_id there's an error.

SubscriptionViewModelBuilder already knows how to handle the case
in which the user is a member of a group but has not subscription
of their own, so guarding against the crash is enough to fix
the issue.

services/web/app/coffee/Features/Subscription/SubscriptionController.coffee

@@ -97,7 +97,7 @@ module.exports = SubscriptionController =
 				logger.log user: user, "redirecting to plans"
 				res.redirect "/user/subscription/plans"
 			else
-				RecurlyWrapper.getSubscription subscription.recurlySubscription_id,
+				RecurlyWrapper.getSubscription subscription?.recurlySubscription_id,
 					includeAccount: true,
 					(err, usersSubscription)->
 						# always render the page, but skip the recurly link if