In a link_multiple column, is None ever a valid list entry?

Anvil Q&A
1

What I’m trying to do:
Take an Anvil-written CSV file, exported from a table via the Anvil IDE, and write a routine for importing it into a similar table.

For example, I have data in one of an App’s database’s tables, and I want to copy it into the same table, but in one of the App’s other databases.

I want to make sure that I have all of the potential column types covered.

In all of the examples I’ve tried so far, a link_multiple column is rendered into CSV format in one of the following forms:

  1. "" – from a column value of None
  2. "#ROWS[]" – from a column value of [] (an empty list)
  3. "#ROWS[[t,r1],[t,r2],…]" – from a column value containing row ids,
    where t is the numerical table id, and r1, r2, … are row numbers within that table. This is a rendition of the

In my sample data, I have seen a None or "null" entry for a link_single column. So it makes sense to me that one might appear inside a link_multiple list; but I’ve never seen one. Nor will the IDE let me enter one manually.

Just wondering whether this is a case that I need to accommodate.