How can I fix fatal RevSlider error in dashboard after upgrading to PHP 7? [closed]

I was able to fix the error by hotfixing the RevSlider plugin on my server as documented here.

In revslider/includes/framework/base-admin.class.php, I changed the following line (l. 21 of my version) from:

private static $arrMetaBoxes="";         //option boxes that will be added to post

to:

private static $arrMetaBoxes = array();    //option boxes that will be added to post

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