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

Loading the Savegame Unreal.wgf from
https://www.magentacloud.de/share/tu4ayusx.k

provokes this ASAN error in
==1418==ERROR: AddressSanitizer: heap-use-after-free on address 0x6040025b5898 at pc 0x00010b77478e ...
#2 0x10b75f8cc in Widelands::PortDock::cleanup(Widelands::EditorGameBase&) portdock.cc:200

please confirm you can reproduce it and can fix the regression tests.

new code looks fine.