Bug: Date picker - clicking "today" multiple times when date range is set clears the date

Steps to reproduce the behavior

1. Open a card
2. Create a date property and edit it
3. Select a date
4. Enable "Date range" and select an end date
5. Click on the "today" button - it sets start date to today
6. Click "today" again - it sets the end date to today
7. Click "today" again - it clears the date
8. Click "today" again - it re-sets the date to just today, without a range

Expected behavior

Clicking "today" the third time should not clear the date.

Screenshots

https://user-images.githubusercontent.com/46905241/148566850-962820c6-14d3-422c-8223-8bdcfa259b5e.mov

Edition and Platform

• Edition: Mattermost plugin
• Version: v0.12 RC1
• Browser and OS: Mac Chrome

Additional context

If only a single date is selected to begin with, clicking "today" multiple times does not clear the picker.