3.2.2 Bug Fixes

Just a couple bug fixes to correct a couple problems some users were experiencing. If you encounter a bug, please try upgrading and see if it's still there.

• Added check to placeable_selection_ui.gd to make sure placeable set in array are not null (gives warning for each null placeable)
• Fixed a bug where invalid preview_instance that were already freed in the building_system were trying to be freed again