Fill: Crash if there are remaining unfilled locations

Fill.py

@@ -570,6 +570,26 @@ def mark_for_locking(location: Location):
         print_data = {"items": items_counter, "locations": locations_counter}
         logging.info(f"Per-Player counts: {print_data})")
 
+        more_locations = locations_counter - items_counter
+        more_items = items_counter - locations_counter
+        for player in multiworld.player_ids:
+            if more_locations[player]:
+                logging.error(
+                    f"Player {multiworld.get_player_name(player)} had {more_locations[player]} more locations than items.")
+            elif more_items[player]:
+                logging.warning(
+                    f"Player {multiworld.get_player_name(player)} had {more_items[player]} more items than locations.")
+        if unfilled:
+            raise FillError(
+                f"Unable to fill all locations.\n" +
+                f"Unfilled Locations({len(unfilled)}): {unfilled}"
+            )
+        else:
+            logging.warning(
+                f"Unable to place all items.\n" +
+                f"Unplaced items({len(unplaced)}): {unplaced}"
+            )
+
 
 def flood_items(multiworld: MultiWorld) -> None:
     # get items to distribute