fix: handle address being undefined (#209)

I observed a crash while running IPFS, need to do more investigation
as to the cause but this is the fix.

src/listener.ts

@@ -113,12 +113,16 @@ export function createListener (context: Context) {
         throw new Error('Incorrect server address type')
       }
 
-      // Because TCP will only return the IPv6 version
-      // we need to capture from the passed multiaddr
-      if (listeningAddr.toString().startsWith('/ip4')) {
-        addrs = addrs.concat(getMultiaddrs('ip4', address.address, address.port))
-      } else if (address.family === 'IPv6') {
-        addrs = addrs.concat(getMultiaddrs('ip6', address.address, address.port))
+      try {
+        // Because TCP will only return the IPv6 version
+        // we need to capture from the passed multiaddr
+        if (listeningAddr.toString().startsWith('/ip4')) {
+          addrs = addrs.concat(getMultiaddrs('ip4', address.address, address.port))
+        } else if (address.family === 'IPv6') {
+          addrs = addrs.concat(getMultiaddrs('ip6', address.address, address.port))
+        }
+      } catch (err) {
+        log.error('could not turn %s:%s into multiaddr', address.address, address.port, err)
       }
 
       return addrs.map(ma => peerId != null ? ma.encapsulate(`/p2p/${peerId}`) : ma)