Make no ipv4-addr on iface warn instead of error

cmd/app/main.go

@@ -59,9 +59,8 @@ func main() {
         logger.Error.Fatal(err)
     }
     if(len(addrs) == 0){
-        logger.Error.Fatal("Interface doesnt have IPv4-Adresses")
+        logger.Warn.Println("Interface doesnt have IPv4-Adresses")
-    }
+    } else {
-
         // Add the IPv6 address to the interface
         ipv6Str := *convertIPv4ToIPv6(&ipv6Format, addrs[0].IPNet)
         ipv6, err := netlink.ParseAddr(ipv6Str)
@@ -78,6 +77,7 @@ func main() {
                 logger.Error.Fatalf("Failed to set address on interface: %v", err)
             }
         }
+    }
 
     // Create a WireGuard client
     client, err := wgctrl.New()