101 - Fix date label not being cleared when both selected dates are unset

[Rayhatron]

#101

There is a bug where the label above the "Edit date filter" button isn't cleared after unsetting dates. Steps to reproduce:

• Click "Edit date filter" button
• Select a date in both date pickers
• Click "Confirm" button
• The label above the "Edit date filter" button should show text that has the two selected dates
• Click "Edit date filter" button again
• Click the two "Unset" buttons for the date pickers
• Click "Confirm" button
• The label above the "Edit date filter" will remain but this shouldn't be the case

Acceptance criteria

• The final result of repeating the steps mentioned above should be the label above the "Edit date filter" button will be cleared.