Task progress is not discarded when task is interrupted

If a task is interrupted for any reason (error due to missing element, any other kinds of errors), the progress for that task should be discarded. 

The current behavior is to skip the task.

When the user clicks on the overlay, a modal should open asking the user if they want to close the task. (driver.js confirm on exit functionality https://driverjs.com/)

For page reloads the task persists and will automatically start again.