enum MULTIPLY not found on import

[netpipe]

in the import_b3d.py script i had to comment out line 337

   # material.blend_method = 'MULTIPLY' if mat.rgba[3] < 1.0 else 'OPAQUE'

https://github.com/netpipe/LunaGames <- Station.pk3 if you extract it and import the building.b3d file it has nice clear textures in blender but when i goto export it the glass is not transparent anymore in the game engine.