Loss of focus when cancelling adding a new task on empty filtered list

[SzymonSzott]

Steps to recreate:

1. Apply a filter which generates an empty list
2. Create a new task
3. Cancel by pressing Escape

The focus remains in the task entry bar. Had the list contained items, the focus would have moved to the task list. The problem with the focus remaining in the entry bar is that this precludes the use of keyboard shortcuts (such as applying a different filter).