Can a parameter that is a table of records have a NULL default value?

 I have a procedure with a long list of parameters.  One of the parameters is a pl/sql table of records.

But sometimes the procedure will be called with data in the table of records, and sometimes not.  (Sometimes there will not be any data to put in the table of records.)

Numbers, varchars and dates can be declared with a DEFAULT NULL.  Is there something similar for tables of records?

Ex.

TYPE myRec IS RECORD

    (column1 varchar2,  column2  number);

TYPE myTableOfRecords is TABLE of myRec;

Procedure HandleMyRec (

         inputVar1  IN VARCHAR2

       , inputVar2  IN VARCHAR2  DEFAULT NULL

       ,inputVar20  IN myTableOfRecords

      ) .....

If there's no data for inputVar20, it needs to default to NULL.  How can this be done?