Selecting "none" in the picker followed by back results in an inconsistent state

Sequence

1. in installation options, click "next"
2. in package selection, click "none"-selection
3. click "back" 

What happens

• in installation options the default option is selected, but clicking next and browsing the contents in the customize-view shows that its contents are not to be installed (corresponding to the "none"-selection)

Expected results

• if user clicks on "none", clicking back afterwards should result either
  • de-selection of the installation option (when user selects it again, it overrides the "none"-selection). This would prevent the user from proceeding, but the checkboxes are prominent enough for the user to notice. 
  • re-selection of the installation option (overriding the "none"-selection"). The user's choice disappears when they hit back, this may not be what they expect. 
  • select "custom" installation option instead with nothing selected in addition to the mandatory items.