If no data exists for a given population, Get_Index_By_Population returns a READ FAILED to the client instead of returning that no data was found.

[tstrott]

For example, if you have no cities with a population of 50000 in the DB, then a "Get_Index_By_Population 50000" is going to return READ FAILED instead of something like "No records found."

[tstrott]

This is a low priority.