The green filter selection count of the Time Period filter should be 0 when no time periods are selected
As a DE user
When browsing the visualisation page and having no filter selections
Then in order to achieve consistency (and correct behaviour) of all green filter selection counts, the green filter selection counts should all be 0 (zero), including the "Time Period" filter.
Generically, whenever there is no Time Period filter selection (even if there are selections in other filters), the green filter selection count of the Time Period filter should be 0.