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

--HG--
extra : transplant_source : %60%0C%94%06%12%DFZ%8C%D3%23%FA%16%7B%E2%00%22%E9%1ES%BD
Fix account move cache computation when second currency

issue3645
review3131002
(transplanted from eb1bb2a9bf72d7946938c672bed88f7f422af3f5)

--HG--
extra : transplant_source : %EB%1B%B2%A9%BFr%D7%94i8%C6r%BE%D8%8F%7FB%2A%F3%F5
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