inactive optionvalues don't show up in participant exports

a participant field has a custom field containing option values. Participants choose one of these option values. The option value that the participants chose gets disabled after they chose it. In a participant export containing this custom field the participants who chose for the disabled option will have a blanc space in the table on that location. Expected is having the option they chose over there, all-tough it has been disabled, and isn't available to choose any more.

to recreate this on a demo site:

1. create a participant to the fall fundraiser dinner with a soup preference
2. go to custom fields and edit the food preference custom field
3. deactivate the soup selection you chose in step 1
4. find participants to the fall fundraiser dinner
5. select all participants and export them using 'select fields to export'
6. select the fields to export:
   • individual - display name to find the person you gave the food selection to
   • participant - food preference: soup selection the field we are interested in
7. open the exported file. The soup selection for the disabled field isn't in there. When there are participants who chose for a soup that is still active the soup selection is in there for them