smtp: require templates only if a server is configured or in service mode

This regression was introduced after recent changes to allow setting the SMTP
settings from the WebAdmin UI.

Fixes #1217

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/cmd/startsubsys.go

@@ -114,7 +114,7 @@ Command-line flags should be specified in the Subsystem declaration.
 				os.Exit(1)
 			}
 			smtpConfig := config.GetSMTPConfig()
-			err = smtpConfig.Initialize(configDir)
+			err = smtpConfig.Initialize(configDir, false)
 			if err != nil {
 				logger.Error(logSender, connectionID, "unable to initialize SMTP configuration: %v", err)
 				os.Exit(1)