Change TPT handling of zero-length strings - forum topic by mzs

The article "Teradata Parallel Transporter Supports Quoted VARTEXT in TTU14.00" has a passing comment that there is a possibility to change TPT handling of zero-length strings:
"The user can specify how empty data values are to be handled:

• They can be assigned NULL (the default, for backward compatibility).
• They can be set to zero-length VARCHARs."

When I import a delimited file using TPT, I get NULLs in a table in place of zero-length strings in a file.  I searched through TPT documentation, but did not find any switch, or parameter to modify that behavior.  Has anyone managed to successfully do that? 
Thank you