set title to [Unknown] for newly added feeds, instead of blank string

backend.php

@@ -1658,10 +1658,11 @@
 					
 					$result = db_query($link,
 						"INSERT INTO ttrss_feeds (owner_uid,feed_url,title,cat_id) 
-						VALUES ('".$_SESSION["uid"]."', '$feed_link', '', $cat_qpart)");
+						VALUES ('".$_SESSION["uid"]."', '$feed_link', 
+						'[Unknown]', $cat_qpart)");
 
 					$result = db_query($link,
-					"SELECT id FROM ttrss_feeds WHERE feed_url = '$feed_link' 
+						"SELECT id FROM ttrss_feeds WHERE feed_url = '$feed_link' 
 						AND owner_uid = " . $_SESSION["uid"]);
 
 					$feed_id = db_fetch_result($result, 0, "id");

functions.php

@@ -216,7 +216,7 @@
 				check_feed_favicon($feed_url, $feed, $link);
 			}
 
-			if (!$registered_title) {
+			if (!$registered_title || $registered_title == "[Unknown]") {
 				$feed_title = db_escape_string($rss->channel["title"]);
 				db_query($link, "UPDATE ttrss_feeds SET 
 					title = '$feed_title' WHERE id = '$feed'");