Feature/1261/no recipient fixes

Targets #1261 (closed)

Summary

1. Removed refreshing of tasks notification entries when a task is updated (removed from useEffect) as this was removing the empty entries that were just added by the user
2. Deleting a notification entry when there is no recipient & email template selected, but placed a check to not have delete action when it's a new task
3. Removed disable logic from "Add notification recipient" button
4. Removed existing check that was allowing the notification save API call when recipient is empty