markAsTouched on empty array not working

[fredpeaks]

Describe the bug
When markAsTouched is called on a form containing empty arrays , all the controls are touched but the empty arrays controls aren't.

To Reproduce
Steps to reproduce the behavior:
https://stackblitz.com/edit/stackblitz-starters-ygcq8n?file=src%2Fform-reducer.ts

Expected behavior
Empty arrays controls should be marked as touched.

Library version:
8.0.0

Additional context
I've already seen the related closed issue : #257