Using date Dimension with emtpy date

Hey, I need a suggestion.

I have a set of FACT which have a "sale" date and a "ship" date.
So I created in my model two Date Dimensions, one connected to the Sale and one to the Ship.

Unfortunately in some cases a product is not shipped, so the Ship date is empty.

But if I create this relationship as active, all the rows without a Ship date are filtered out, but I don't want this. I want to see products which has been sold but not yet shipped and I can't make it work.

I know I could make the relationship with the Ship date as inactive, but this generate other issues whenever I want to filter out by ship date, as slicers does not work with inactive relationships.

In general, in a dimensional model, you create an "empty" date (like 00/00/0000) and you link these emtpy ones to this "sort of null" row, but PBI does not allow this as dates in the date dim must be contiguous.

Any help?

Thanks