added logging

services/web/app/coffee/Features/User/UserHandler.coffee

@@ -7,6 +7,7 @@ logger = require("logger-sharelatex")
 module.exports = UserHandler =
 
 	populateGroupLicenceInvite: (user, callback)->
+		logger.log user_id:user._id, "populating any potential group licence invites"
 		licence = SubscriptionDomainHandler.getLicenceUserCanJoin user
 		if !licence?
 			return callback()