Replace Missing Table

Passes through the primary data table, but if that table is empty or contains no column information, it substitutes it with the Secondary table

@takbb Brian Bates 25 November 2022

Input ports

1. Type: Table
   Main Data Table
   The Primary Data table to be used by the flow
2. Type: Table
   Secondary Table
   The Data table to be substituted if the primary data table is empty or contains no column information

Output ports

1. Type: Table
   Output
   The Primary Data table if it is not empty. The secondary Data Table if the Primary Data table is empty