log parsing errors to stdout

extensions/proxy/pkg/command/server.go

@@ -43,7 +43,11 @@ func Server(cfg *config.Config) *cli.Command {
 		Usage:    fmt.Sprintf("start %s extension without runtime (unsupervised mode)", cfg.Service.Name),
 		Category: "server",
 		Before: func(c *cli.Context) error {
-			return parser.ParseConfig(cfg)
+			err := parser.ParseConfig(cfg)
+			if err != nil {
+				fmt.Printf("%v", err)
+			}
+			return err
 		},
 		Action: func(c *cli.Context) error {
 			logger := logging.Configure(cfg.Service.Name, cfg.Log)