fix python `if` syntax in `format_transaction`

LedgerHQ / btchip-python

Ledger HW.1 Python API

http://www.ledger.co

Apache License 2.0

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Closed brandoncurtis closed 6 years ago

brandoncurtis commented 7 years ago

This fixes format_transaction.

Prior to this fix, every call to format_transaction fails with

TypeError: object of type 'bool' has no len()

Fixes Electrum-LTC support for Ledger Nano S.