Fallback for empty custom fields

You could do it like this:

// store post meta in a variable and use that so you aren't pulling the post meta data twice
$landPricing = get_post_meta($post->ID, "Pricing_Land_Only", true)
if(!empty($landPricing))
{
    echo $landPricing;
}
else
{
    echo "Sorry, nothing was found.";
}