[PHP 7.2] My fix for «Warning: count(): Parameter must be an array or an object that implements Countable in lib/internal/Magento/Framework/View/Design/Theme/ThemeList.php on line 237»

Issues
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5

My fix

You need to patch the Magento\Framework\View\Design\Theme\ThemeList::_prepareConfigurationData() method.

Replace the line:

with the following one:

if ($parentPathPieces && count($parentPathPieces) == 1) {
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