LYNN WORTHY St. Louis Post-Dispatch Aug. 17—Cardinals righthander Adam Wainwright proved his tank isn’t empty. He showed enough guts and guile to push himself through six innings and a quality start after he’d turned in two of his worst starts of the season. However, that wasn’t enough as the Cardinals offense sputtered for the first six innings in a 4-2 loss to the New York Mets in the first…