Handle nil translation key
source link: https://github.com/rails/rails/pull/40788
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I18n.translate returns nil when given a nil key, unless a default is also specified. If a default is specified, the nil key is treated as a missing key.
In Rails 6.0, the translate helper always returned nil when given a nil key. After #40773, the translate helper always raised an I18n::ArgumentError when given a nil key. This commit fixes the translate helper to mirror the I18n.translate behavior when given a nil key, with and without a default.
Fixes #40773 (comment).
Since this changes the behavior of the translate helper when both a nil key and a default are specified, I've added a CHANGELOG entry. If we do not want to change this for 6.1.1, I can create a separate PR against 6-1-stable that restores the Rails 6.0 behavior for nil keys.
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