Code review comment for lp:~widelands-dev/widelands/new-shipping

I now got
Assertion failed: (ship.get_nritems() == 0), function ship_arrived,
file ../src/economy/portdock.cc, line 383.
   after
./widelands --loadgame=~/Downloads/ShipCrash5.wgf

Somwhat after 1:56... from https://www.magentacloud.de/share/tu4ayusx.k

Do frisians have very special wares?