screen.ts getBuffer debugging else branch by writing to rowBuffer 2

Author: KierPalin

screen.ts

@@ -152,11 +152,11 @@ namespace user_interface_base {
             else {
                 // basic.showNumber(chunkIndex)
                 const rowBuf = Buffer.create(bitmap.width);
-                for (let i = 0; i < rowBuf.length; i++) {
-                    rowBuf[i] = 3;    
-                }
 
                 bitmap.getRows(startingRow, rowBuf);
+        for (let i = 0; i < rowBuf.length; i++) {
+          rowBuf[i] = 3;    
+        }
                 const res = rowBuf.slice(startIndex % width, chunkSize);
                 if (res.length > 16)
                     basic.showString("B")