api: block real categories with 0 feeds to appear in getCategories

classes/api.php

@@ -131,13 +131,17 @@ class API extends Handler {
 			$nested_qpart = "true";
 
 		$result = db_query($this->link, "SELECT
-				id, title, order_id FROM ttrss_feed_categories
+				id, title, order_id, (SELECT COUNT(id) FROM
+				ttrss_feeds WHERE
+				ttrss_feed_categories.id IS NOT NULL AND cat_id = ttrss_feed_categories.id) AS num_feeds
+			FROM ttrss_feed_categories
 			WHERE $nested_qpart AND owner_uid = " .
 			$_SESSION["uid"]);
 
 		$cats = array();
 
 		while ($line = db_fetch_assoc($result)) {
+			if ($line["num_feeds"] > 0) {
 				$unread = getFeedUnread($this->link, $line["id"], true);
 
 				if ($enable_nested)
@@ -151,6 +155,7 @@ class API extends Handler {
 					));
 				}
 			}
+		}
 
 		foreach (array(-2,-1,0) as $cat_id) {
 			$unread = getFeedUnread($this->link, $cat_id, true);