fix: Item-wise Sales and Purchase register with no item codes #41373

[Poorvi-R-Bhat]

1. There was a mismatch in the Sales Register and Item-wise Sales Register Report as the Sales Invoices which does not have the item codes in the Sales Invoice Item table were not displaying in the item-wise Sales Register.

Screenshot for the Sales Register:

Screenshots for the Item-wise Sales Register
Before:

After:
Now the Item-wise Sales Register Displays the Sales Invoices which does not have the Item Code.

2. There was a mismatch in the Purchase Register and Item-wise Purchase Register Report as the Purchase Invoices which does not have the item codes were not displaying in the item-wise Purchase Register.

Screenshot for the Purchase Register:

Screenshots for the Item-wise Purchase Register
Before:

After:
Now the Item-wise Purchase Register Displays the Purchase Invoices which does not have the Item Code.