Merging SUBlists with null values

[Giovanni_Succi]

Hello,
going crazy, and I need the awesome forum help…

I need to Join.List the sub lists of two lists of equal length, but the nodes do not work because there are some Nulls.

In the screen shot, item 0 of both lists needs to be Join.list even if one of them is Null…
The List.Combine has a Join.List in the Comb input.

Resulting Item 0 should be those two Wall elements (Null should just disappear when joined to a list with some elements?), the item 1 should be the joined list of the wall elements in both item 1(s) of the two lists, and so on.

Also tried:

but note that items 1 have 9 walls plus 19 walls, it should be a list on 28 walls, instead of only 19…

Thank you…

Regards

gio

[Nissal]

Have you tried List.Clean in null list.

[infeeeee]

This is what you want?

[lkichenin]

You can normalize the rank of your lists with this node, quite useful :

[Giovanni_Succi]

Thank you, yes infeeee example was what I was looking to obtain, but I got there using this, which also replaces nulls with empty lists:

Will see if it works in my script… Maybe leaving the nulls alone will also work.

thank you