On enWS, the [[MediaWiki:Proofreadpage_pagenum_template]] template is invoked even for pages without text.
According to the following code, such pages should not receive a page number:
if ( $qualityLevel !== PageLevel::WITHOUT_TEXT ) { $pagenum = $pageNumber->getRawPageNumber( $language ); $formattedNum = $pageNumber->getFormattedPageNumber( $language ); $out .= '<span>{{:MediaWiki:Proofreadpage_pagenum_template|page=' . $text . "|num=$pagenum|formatted=$formattedNum}}</span>"; }