Allow blank cells to be ,, instead of ,"",

A blank cell is currently interpreted as a string with 0 characters. This is why it is shown as `...,"",...` in the generated CSV.

In some use-cases, a blank cell could mean `null`, which you would represent with `...,,...`

It would be great if TableTool would default to the second or at least allow to configure the second as a default

Start by locating TableTool’s CSV generation and the handling of blank cells. Determine where empty strings become quoted empty fields, then verify that blank cells can use the unquoted null representation by default or through configuration.

Written by the indexing model from the issue text.