[FIX] stock_voucher: prevent division by zero in declared value calculation #819
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When product_id differs between sale order line and stock move, the move
is treated as a potential BOM component. If no valid BOM is found or no
components match, the picking_avg and done_avg lists remain empty,
causing a ZeroDivisionError when calculating averages.
Add validation to ensure lists are not empty before division.
Forward-Port-Of: #807