Unchecked runtime error on ICMP message

[kennysong]

In uproxy_core.ts, there's a new function called getNetworkInfo() that probes the user's router for details about its NAT configuration. Since we don't have a reliable way of finding the router's internal IP, we just test a list of popular router IPs (see line 354).

Sometimes, if you run getNetworkInfo() repeatedly, some of these router IPs will return an ICMP error of:

Type: 3 (Destination unreachable)
Code: 13 (Communication administratively filtered)

This results in a error being logged in the Chrome console:

Is it possible to handle this error in the freedom socket module so that it doesn't appear in the console?