Code to Check If No Row Created in a of Data Table, Close the Data Table

[#1]

I am creating a list data table subset from a main data table. Then, I manipulate the data through Tabulate() and make into the table for processing. Then, check each of the data table N Rows, if N Rows = 0, close the data table. Finally, append the data table into the report. Below is my script. 

The problem is after I add in below codes, to check the N Rows, it no longer work. No error show up.

If(N Rows(mDT)==0, Close(mDT, no save));

I believe might be some error on the code. The overall code might not be well written 

Need guideline and help here.

saveFolder = "$TEMP/";

listDT = {};
listtab = {};
mDT = {};

col = Column(dt1Sub, ":PART");

colLevs = Associative Array(col) << Get Keys;

hb = V List Box( );

For (i=1, i<=NItems(colLevs), i++,

     r2get = dt1 << Get Rows Where(:PART == colLevs[i]);

     listDT[i] = dt1 << Subset(Rows(r2get));

     listDT[i] << Set Name(Char(colLevs[i]));
 
     listDT[i] << Save( saveFolder || Word( 1, listDT[i] << get name, "-" )||".csv");
     
     listtab = listDT[i] << Tabulate(
	               Show Control Panel( 0 ),
	               Add Table(
		               Column Table( Grouping Columns( :ORDER ) ),
		               Column Table( Statistics( Sum ), Analysis Columns( :Qty ) ),
		               Row Table(
			               Grouping Columns(
				              ::PART,
				              ::PART DESC,
				              :LOW PART #,
				              :LOW PART DESC,
				              :FAILURE MODE
			               )
		               )
	               )
                ); 
                
     mDT= listtab << Make Into Data Table;   
     
     Close(listDT[i], no save);
    
     mDT << New Column ("Criteria", Character, "Nominal",
     	      Formula(
     	      	If(As Column(6)>= 3, "Failure")
     	      )
     );
     mDT:Criteria << Delete Formula;
     mDT << Sort(By(Column(6)),Order(Descending), Replace Table);
     mDT << Select Where (:As Column(6) == 0);
     mDT << Delete Rows;
     
     If(N Rows(mDT)==0, Close(mDT, no save));   
          
     mDT << Set Window Size (2400, 800);
     
     mDT << Get As Report;
     
     hb << Append( ( mDT << Get As Report ) );
          
);

New Window( "Report", hb );

[#2 · Accepted solution]

It could be that you continue the loop execution after closing the datatable. You could try moving the rows in for loop after if-statement to else statement:

If(N Rows(mDT) == 0,
	Close(mDT, no save)
,//else
	mDT << Set Window Size(2400, 800);
	mDT << Get As Report;
	hb << Append((mDT << Get As Report));
);

or useContinue() after closing mDT:

If(N Rows(mDT) == 0,
	Close(mDT, no save)
	Continue();
);

[#3 · Accepted solution]

You are attempting to pass messages to your mDT object even when the table has been closed.  See if the JSL below works for you

saveFolder = "$TEMP/";

listDT = {};
listtab = {};
mDT = {};

col = Column( dt1Sub, ":PART" );

colLevs = Associative Array( col ) << Get Keys;

hb = V List Box();

For( i = 1, i <= N Items( colLevs ), i++,
	r2get = dt1 << Get Rows Where( :PART == colLevs[i] );
	listDT[i] = dt1 << Subset( Rows( r2get ) );
	listDT[i] << Set Name( Char( colLevs[i] ) );
	listDT[i] << Save( saveFolder || Word( 1, listDT[i] << get name, "-" ) || ".csv" );
	listtab = listDT[i] << Tabulate(
		Show Control Panel( 0 ),
		Add Table(
			Column Table( Grouping Columns( :ORDER ) ),
			Column Table( Statistics( Sum ), Analysis Columns( :Qty ) ),
			Row Table(
				Grouping Columns(
					::PART, ::PART DESC, :LOW PART #, :LOW PART DESC, :FAILURE MODE
				)
			)
		)
	); 
                
	mDT = listtab << Make Into Data Table;   
     
	Close( listDT[i], no save );
    
	mDT << New Column( "Criteria",
		Character,
		"Nominal",
		Formula( If( As Column( 6 ) >= 3, "Failure" ) )
	);
	mDT:Criteria << Delete Formula;
	mDT << Sort( By( Column( 6 ) ), Order( Descending ), Replace Table );
	mDT << Select Where( :As Column( 6 ) == 0 );
	mDT << Delete Rows;
     
	If( N Rows( mDT ) == 0,
		Close( mDT, no save )
		, 	           
		mDT << Set Window Size( 2400, 800 );
		mDT << Get As Report;
		hb << Append( (mDT << Get As Report) );
	);
);

New Window( "Report", hb );

[#4]

it work perfectly. Thanks Jim and Jarmo