add correct handling for param fee in prepare_transaction when fee is 0#91

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ManFromSiberia wants to merge 2 commits intoofek:masterfrom ManFromSiberia:master

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Commits on Dec 6, 2019

add correct handling for param fee in prepare_transaction when fee is 0
ManFromSiberia
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add correct handling for param fee in prepare_transaction when fee is 0 for other classes
ManFromSiberia
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