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FIX: ensures we don't attempt to concat an empty list (#10600)
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@ -120,7 +120,7 @@ class PostActionNotifier
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end
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custom_post_revision_notifier_recipients.each do |block|
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user_ids.concat(block.call(post_revision))
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user_ids.concat(Array(block.call(post_revision)))
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end
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if user_ids.present?
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