Change Details

The `read_historcial_rates` method returned `None`, so the `cached_history` var in `get_historical_rates_safe` was not properly initialized to an empty dict, and therefore `cached_history.update(new_history)` would raise (with the exception caught and ignored). This makes `cached_history` is an empty dict `{}` if the file does not already exist. Similar fix to commit a42cdb6 electroncash#2898

The `read_historcial_rates` method returned `None`, so the `cached_history` var in `get_historical_rates_safe` was not properly initialized to an empty dict, and therefore `cached_history.update(new_history)` would raise (with the exception caught and ignored). This makes `cached_history` is an empty dict `{}` if the file does not already exist. Similar fix to commit a42cdb6 [[https://github.com/Electron-Cash/Electron-Cash/pull/2898 | electroncash#2898]]

The `read_historcial_rates` method returned `None`, so the `cached_history` var in `get_historical_rates_safe` was not properly initialized to an empty dict, and therefore `cached_history.update(new_history)` would raise (with the exception caught and ignored). This makes `cached_history` is an empty dict `{}` if the file does not already exist. Similar fix to commit a42cdb6 [[https://github.com/Electron-Cash/Electron-Cash/pull/2898 | electroncash#2898]]