get external ip shows 0.0.0.0 in info

[Himan2001]

i found another bug in the "getinfo":

"connections" : 23,
"proxy" : "",
"ip" : "0.0.0.0",
"difficulty" : {

This is from a ember-daemon behind a nat-router.
It looks like, that the get-external-ip function is not working?
Normaly i know from other daemons, that they made right after startup a call to
a list of stun-servers to get the own external ip. In the ember-log i see no entry for
such a call...

The ip: is correctly shown on a system with a direct internet-connection or a vpn-session
without any NAT.