Drop empty counts in prompress_posts_total.

[gassan]

On. installations with many posts_statuses and/or post_types we have too many zero values.
Do we need them?

[PeterBooker]

I am hesitant to automatically remove them, as potentially a zero value is useful data (albeit unlikely).

We could make it a filter, allowing sites to declare that they do not want zero values?

Something like:

$drop_zero = \apply_filters(
    'prompress_posts_drop_zero_counts',
    true,
    $post_type,
    $status,
    (int) $count
);

if ( $drop_zero && ! $count ) {
    continue;
}

[gassan]

I’ll add this filter in the near future.