add message try catch to CommandAssignmentDelete

NodeApp/src/commander/assignment/subcommands/AssignmentDeleteCommand.ts

 import CommanderCommand  from '../../CommanderCommand';
 import DojoBackendManager from '../../../managers/DojoBackendManager';
 import AccessesHelper from '../../../helpers/AccessesHelper';
+import ora from 'ora';
 // import GitlabManager from '../../../managers/GitlabManager';
 // import ExerciseRunHelper from '../../../helpers/Dojo/ExerciseRunHelper';
 // import ora from 'ora';
@@ -13,7 +14,6 @@ class AssignmentDeleteCommand extends CommanderCommand {
           this.command
           .description('delete an assignment')
           .arguments('<name>')
-          // .argument('-n, --name <name>', 'name of the assignment')
           .action(this.commandAction.bind(this));
      }
      
@@ -22,8 +22,19 @@ class AssignmentDeleteCommand extends CommanderCommand {
                if (!await AccessesHelper.checkTeachingStaff()) {
                     return;
                }
-               const tmp = await DojoBackendManager.delAssignment(name);
-               console.log(tmp);
+          }
+          {
+               const spinner = ora({
+                    text  : 'Deleting assignment',
+                    indent: 4
+               }).start();
+               
+               try {
+                    await DojoBackendManager.delAssignment(name);
+                    spinner.succeed('Assignment deleted');
+               } catch (error) {
+                    spinner.fail('Error while trying to deleting the assignment');
+               }
           }
      }
 }