feat: add omitempty to IsHidden for both json and yaml

Close #539

Signed-off-by: weichou <[email protected]>

v2/dtos/devicecommand.go

@@ -11,7 +11,7 @@ import "github.com/edgexfoundry/go-mod-core-contracts/v2/v2/models"
 // https://app.swaggerhub.com/apis-docs/EdgeXFoundry1/core-metadata/2.x#/DeviceCommand
 type DeviceCommand struct {
 	Name               string              `json:"name" yaml:"name" validate:"required,edgex-dto-none-empty-string,edgex-dto-rfc3986-unreserved-chars"`
-	IsHidden           bool                `json:"isHidden" yaml:"isHidden"`
+	IsHidden           bool                `json:"isHidden,omitempty" yaml:"isHidden,omitempty"`
 	ReadWrite          string              `json:"readWrite" yaml:"readWrite" validate:"required,oneof='R' 'W' 'RW'"`
 	ResourceOperations []ResourceOperation `json:"resourceOperations" yaml:"resourceOperations" validate:"gt=0,dive"`
 }