Replace wrong usage of False by None
(transplanted from 600c940612df5a8cd323fa167be20022e91e53bd)

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extra : transplant_source : %60%0C%94%06%12%DFZ%8C%D3%23%FA%16%7B%E2%00%22%E9%1ES%BD
Fix computation of second currency amount

issue3664
review3351002
(transplanted from b81862858d215919a2c3355d4075c656e5ed516b)

--HG--
extra : transplant_source : %B8%18b%85%8D%21Y%19%A2%C35%5D%40u%C6V%E5%EDQk