This function takes a dynamicdata table and uses the columns to clear values in local data.
This function has one parameter, dataTableName, which is the name of the dynamicdata table to use.
If the dynamicdata table exists, it returns True.
<@dynamicdata MyDataTable@>foo, bar, baz<@end@>
<$bar = "asdf"$><$exec ddSetLocalEmptyByColumns("MyDataTable")$><$if bar$> [[% This will not execute as bar will be empty. %]]<$endif$>