Pellicola: (I think) I've fixed the map feature

Up until now, the map feature in Pellicola has been rather unreliable. A photo with missing geographical coordinates would make the map spectacularly fail. Since I obsessively geotag all photos, that hadn't been much of an issue for me personally.

However, once this issue popped up, I could no longer ignore it. So I did some tweaking, and I think I've managed to fix the problem. Now, the map shows all geotagged photos and ignores photos without coordinates. And if none of the photos in the library are geotagged, the page shows ¯\_(ツ)_/¯ and nothing else. Because I'm clever like that.