change the namespace selector behavior (#5768)

api/http/handler/stacks/create_kubernetes_stack.go

@@ -54,9 +54,6 @@ func (payload *kubernetesStringDeploymentPayload) Validate(r *http.Request) erro
 	if govalidator.IsNull(payload.StackFileContent) {
 		return errors.New("Invalid stack file content")
 	}
-	if govalidator.IsNull(payload.Namespace) {
-		return errors.New("Invalid namespace")
-	}
 	if govalidator.IsNull(payload.StackName) {
 		return errors.New("Invalid stack name")
 	}
@@ -64,9 +61,6 @@ func (payload *kubernetesStringDeploymentPayload) Validate(r *http.Request) erro
 }
 
 func (payload *kubernetesGitDeploymentPayload) Validate(r *http.Request) error {
-	if govalidator.IsNull(payload.Namespace) {
-		return errors.New("Invalid namespace")
-	}
 	if govalidator.IsNull(payload.RepositoryURL) || !govalidator.IsURL(payload.RepositoryURL) {
 		return errors.New("Invalid repository URL. Must correspond to a valid URL format")
 	}

app/kubernetes/views/deploy/deployController.js

@@ -70,6 +70,7 @@ class KubernetesDeployController {
       RepositoryFetchInterval: '5m',
       RepositoryWebhookURL: this.WebhookHelper.returnStackWebhookUrl(uuidv4()),
     };
+
     this.ManifestDeployTypes = KubernetesDeployManifestTypes;
     this.BuildMethods = KubernetesDeployBuildMethods;
     this.endpointId = this.EndpointProvider.endpointID();
@@ -209,9 +210,15 @@ class KubernetesDeployController {
           throw new PortainerError('Unable to determine build method');
       }
 
+      let deployNamespace = '';
+
+      if (this.formValues.Namespace !== 'default') {
+        deployNamespace = this.formValues.Namespace;
+      }
+
       const payload = {
         ComposeFormat: composeFormat,
-        Namespace: this.formValues.Namespace,
+        Namespace: deployNamespace,
         StackName: this.formValues.StackName,
       };