I'll disagree. That end is right next to the house. A couple of leaves in there to obstruct the flow just slightly and it will end up running out of the end and under the floor.
Given the likely age of the house, it's unlikely to have a DPM under that concrete floor, so directing water away is critical. Obviously the soil will contain water, it's not black vs white, but the lack of an end cap does show a lack of care.
You could probably retrofit one, perhaps after chopping off some of its clips. Slide it in then seal inside with decent sealant.