🐛 user can enter empty task description to start the timer

[bcisneros]

Problem

The user can start a new task without providing a description.

Steps to reproduce

1. Open the application
2. Click on the Start button
3. From the Create Task dialog click on the OK button without entering any description

Expected result

The title displays Task Timer Application - Task 1 where 1 is a consecutive number for tasks with no explicit description.

Observed result

The title displays an empty description.

Definition of Done

• The problem was resolved
• Unit tests are provided
• Pull request is reviewed and approved.