Stop SafeBuffer#clone_empty from issuing warnings
Logic in clone_empty method was dealing with old @dirty variable, which has changed by @html_safe in this commit: https://github.com/rails/rails/commit/139963c99a955520db6373343662e55f4d16dcd1 This was issuing a "not initialized variable" warning - related to: https://github.com/rails/rails/pull/5237 The logic applied by this method is already handled by the [] override, so there is no need to reset the variable here.
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