cleanup

core/src/mindustry/world/blocks/environment/EmptyFloor.java

@@ -3,12 +3,15 @@ package mindustry.world.blocks.environment;
 import mindustry.content.*;
 import mindustry.world.*;
 
+/** Empty floor is *not* equivalent to air. Unlike air, it is solid, and still draws neighboring tile edges. */
 public class EmptyFloor extends Floor{
 
     public EmptyFloor(String name){
         super(name);
         variants = 0;
         canShadow = false;
+        placeableOn = false;
+        solid = true;
     }
 
     @Override