Update Html.php
Travis says no need to initialize private class variable to null.
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@ -136,7 +136,7 @@ class Html extends BaseWriter
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*
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*
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* @var null|callable
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* @var null|callable
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*/
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*/
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protected $editHtmlCallback = null;
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protected $editHtmlCallback;
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/**
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/**
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* Create a new HTML.
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* Create a new HTML.
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