Fix `dict` `len` confusion

DjangoGirls / tutorial

This is a tutorial we are using for Django Girls workshops

http://tutorial.djangogirls.org/

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Closed das-g closed 2 years ago

das-g commented 2 years ago

Changes in this pull request:

check len(…) of dict before (optionally) adding additional items, so that result is predictable

fixes #1745