[amibroker] Detecting barcount = 0

["whitneybroach" <WhitneyBroach@xxxxxxxxx>]

While creating watchlists from external files, I encounter the problem
of a symbol having zero bars in the current database.  I intend to
export required bars from another program into the db to fix these.

Detecting all of the zero-bar symbols is the task.

Can AFL report a zero-bar symbol?

So far code like this produces nothing in Scan or Explore:
===============
NumColumns = 2;
setbarsrequired( 0, 0 );
bi  =	BarIndex();
lvbi=	LastValue( bi );
EnableTextOutput( True );
Sell = Short = Cover = 0;
Filter = Buy = lvbi < 2;
if ( Buy )
{
  addcolumn( lvbi, "lvbi", 1.0, colordefault, colordefault );
}
===============



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