guard against possibly undefined team data in 'setPadMetadata'

www/common/outer/async-store.js

@@ -2159,6 +2159,8 @@ define([
             if (!data.channel) { return void cb({ error: 'ENOTFOUND'}); }
             if (!data.command) { return void cb({ error: 'EINVAL' }); }
             var s = getStore(data.teamId);
+            if (!s) { return void cb({ error: 'ENOTFOUND' }); }
+
             var otherChannels = data.channels;
             delete data.channels;
             s.rpc.setMetadata(data, function (err, res) {