I would guess it was used to make a tree in an on-board garden or park, or used decoratively somewhere.
Create a new single-player world (you do not have to destroy your existing one, if applicable) and "admin load" the ship from the catalog panel. Then remove or change this block and any others to your liking and re-save the blueprint. Return to your regular world or server (upload the new blueprint if the latter), "buy" the new blueprint and carry on.