network: fix undef errors

services/Network.qml

@@ -123,9 +123,9 @@ Singleton {
                         active: net[0] === "yes",
                         strength: parseInt(net[1]),
                         frequency: parseInt(net[2]),
-                        ssid: net[3].replace(rep2, ":"),
+                        ssid: net[3]?.replace(rep2, ":") ?? "",
                         bssid: net[4]?.replace(rep2, ":") ?? "",
-                        security: net[5] || ""
+                        security: net[5] ?? ""
                     };
                 }).filter(n => n.ssid && n.ssid.length > 0);