Update CatalogPageAdmin.php #67
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$this->getCatalogParents() can be NULL (if no "parent_class" has been set) or a DATALIST (SiteTree), so before to call the count() method we need to check if it's not null otherwise we get a Warning massage
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$this->getCatalogParents() can be NULL (if no "parent_class" has been set) or a DATALIST (SiteTree), so before to call the count() method we need to check if it's not null otherwise we get a Warning message (unable to call "count" on no countable data)