Improve error messages for odo delete and odo project delete (#5149)

* Improve error message for deleting project.

* Improve error message for `ode delete` when user is not logged in.

* Apply code review suggestions regarding handling error messages.

* Add missing else statement.

* Fix linter once again.

pkg/odo/cli/project/delete.go

@@ -61,7 +61,7 @@ func (pdo *ProjectDeleteOptions) Validate() (err error) {
 	// Validate existence of the project to be deleted
 	isValidProject, err := project.Exists(pdo.Context, pdo.projectName)
 	if !isValidProject {
-		return fmt.Errorf("The project %s does not exist. Please check the list of projects using `odo project list`", pdo.projectName)
+		return fmt.Errorf("The project %q does not exist. Please check the list of projects using `odo project list`", pdo.projectName)
 	}
 	return
 }

pkg/odo/genericclioptions/resolve.go

@@ -3,6 +3,7 @@ package genericclioptions
 import (
 	"context"
 	"fmt"
+	kerrors "k8s.io/apimachinery/pkg/api/errors"
 
 	"github.com/openshift/odo/pkg/localConfigProvider"
 	"github.com/spf13/cobra"
@@ -49,7 +50,13 @@ func (o *internalCxt) resolveNamespace(configProvider localConfigProvider.LocalC
 		// check that the specified namespace exists
 		_, err := o.KClient.GetClient().CoreV1().Namespaces().Get(context.TODO(), namespace, metav1.GetOptions{})
 		if err != nil {
-			errFormat := fmt.Sprintf("You don't have permission to create or set namespace '%s' or the namespace doesn't exist. Please create or set a different namespace\n\t", namespace)
+			var errFormat string
+			if kerrors.IsForbidden(err) {
+				errFormat = "You are currently not logged in into the cluster. Use `odo login` first to perform any operation on cluster"
+			} else {
+				errFormat = fmt.Sprintf("You don't have permission to create or set namespace %q or the namespace doesn't exist. Please create or set a different namespace\n\t", namespace)
+			}
+
 			// errFormat := fmt.Sprint(e1, "%s project create|set <project_name>")
 			err = checkProjectCreateOrDeleteOnlyOnInvalidNamespaceNoFmt(command, errFormat)
 			if err != nil {