If what you want is really only
to prevent WordPress from adding empty
<p></p>
and you’d be happy with removing those after post retrieval from the database, then
function wpse108194_remove_empty_paragraphs( $content ) {
$content = preg_replace( '#<p>\s*</p>#', '', $content );
return $content;
}
add_filter( 'the_content', 'wpse108194_remove_empty_paragraphs', 11 );
will do.
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