IO-1847 Add blank line if no sales lines for QBD export.

server/accounting/qb-receivables-lines.js

@@ -637,6 +637,13 @@ exports.default = function ({
     });
   }
 
+  if (!qbo && InvoiceLineAdd.length === 0) {
+    //Handle the scenario where there is a $0 sale invoice.
+    InvoiceLineAdd.push({
+      Desc: "No estimate lines.",
+    });
+  }
+
   return InvoiceLineAdd;
 };