cargo module, can't set cargo when "ship has cargo" so can't unload said cargo

Issue description

apparently, I set a loose cargo module to bauxite, then set it back to none, but my ship left port about then,
It loaded bauxite, but now I can't unload it, if I mouse over the product to offload dropdown, it gives the error that "Ship has cargo"

Reproduction steps

borked seaport.save

unzip attached save,
load save
look at the warning and click on the "No product assigned to cargo module"
This should take you to the southern cargo depot(4)
look at the northward cargo module (marked with warning icon)
try and set cargo type

Game version and build number

v0.7.8(b481)

Operating system

Windows

Attachments

Files not imported: borked seaport.save

You loaded the ship's compartment with bauxite, where do you think he's going to put it? Remove the cargo module and rebuild it.

why can't I select bauxite for the module? I'd be fine if that was the only choice, but having to destroy a building as the only way to move forward is rediculous.

This was fixed as part of v0.7.9. Thank you!