fix: empty space search incorrectly returning space as fully occupied…

… when completely empty

Affects #525

src/main/java/me/jellysquid/mods/lithium/mixin/minimal_nonvanilla/collisions/empty_space/WorldMixin.java

@@ -31,7 +31,7 @@ public Optional<Vec3d> findClosestCollision(@Nullable Entity collidingEntity, Vo
 
             List<VoxelShape> blockCollisions = LithiumEntityCollisions.getBlockCollisions((World) (Object) this, collidingEntity, searchBox);
             if (blockCollisions.isEmpty()) {
-                return Optional.empty();
+                return collidingShape.getClosestPointTo(originalPosition);
             }
             WorldBorder worldBorder = this.getWorldBorder();
             if (worldBorder != null) {