Allow encryption of empty strings #33
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Running `OpenSSL::Cipher#update` with an empty string results in an `ArgumentError` which prevents Fernet from working. This patch only calls `#update` conditionally, which allows encryption to go through even for an empty string. Fixes fernet#32.
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Running
OpenSSL::Cipher#updatewith an empty string results in anArgumentErrorwhich prevents Fernet from working. This patch only calls#updateconditionally, which allows encryption to go through even for an empty string.Fixes #32.