I did two activities on 11 Feb that didn’t have any performance data associated with them (both were ice skating without a HRM). The mileage and activity type show up in the weekly summary, but there are no activities listed for them on the actual date.
Since you are counting them, it would be nice to have a placeholder on the activities page to show that they are there, even if you can’t click on the activity itself because there’s no performance data to show.
Rather than change the functionality, perhaps just change the option to “Show commutes,” with implication that they are hidden as opposed to not included.