GetDataStringLast

This is a modified version of the "GetDataString" function which gets a string/text from a custom database field.
The modified version allows you to get the last (non empty) string on any given trading bar.

As an example, let us say that you have a database whose name is "db" and a field whose name is "fld".
In that database, there is a GOOG entry on 10/10/2017 which a value of "true".

If you want to plot that entry on a watchlist using:
AddColumn("Name", GetDataString("db", "fld", ""));

You will get an empty string since current date is say 12/11/2017 and there is no entry on that date in the custom database.

Using the modified version woud allow you to display the entry value since this is the last entry available before 12/11/2017.
AddColumn("Name", GetDataStringLast("db", "fld", ""));

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