bundles/pppd: fix KeyError in restart-pppoe-if-no-public-ip

bundles/pppd/files/restart-pppoe-if-no-public-ip

@@ -26,13 +26,18 @@ for i in netifaces.interfaces():
 system_has_public_ip = False
 for iface in ifaces:
     for type in [netifaces.AF_INET, netifaces.AF_INET6]:
-        for ip in netifaces.ifaddresses(iface)[type]:
+        try:
+            ips = netifaces.ifaddresses(iface)[type]
+        except KeyError:
+            continue
+
+        for ip in ips
             try:
                 addr = ip_address(ip['addr'])
 
                 if not addr.is_private and not addr.is_loopback:
                     system_has_public_ip = True
-            except:
+            except Exception:
                 # Apparently not an ip
                 pass