Better detection if serial port is required during upload. (#1398)

Previously we checked the recipe for the {serial.port} key to determine
if the upload requires a serial port, but this is not sufficient because
we must check also for the {serial.port.file} key.

commands/upload/upload.go

@@ -560,7 +560,7 @@ func runTool(recipeID string, props *properties.Map, outStream, errStream io.Wri
 	if strings.TrimSpace(recipe) == "" {
 		return nil // Nothing to run
 	}
-	if props.IsPropertyMissingInExpandPropsInString("serial.port", recipe) {
+	if props.IsPropertyMissingInExpandPropsInString("serial.port", recipe) || props.IsPropertyMissingInExpandPropsInString("serial.port.file", recipe) {
 		return fmt.Errorf(tr("no upload port provided"))
 	}
 	cmdLine := props.ExpandPropsInString(recipe)