gen-search-idx: more conservative batch handling

update.php

@@ -346,7 +346,6 @@
 		while (true) {
 			$result = db_query("SELECT id, title, content FROM ttrss_entries WHERE tsvector_combined IS NULL ORDER BY id LIMIT $limit");
 
-			if (db_num_rows($result) != 0) {
 			while ($line = db_fetch_assoc($result)) {
 				$tsvector_combined = db_escape_string(mb_substr($line['title'] . ' ' . strip_tags($line['content']),
 					0, 1000000));
@@ -357,13 +356,11 @@
 			$processed += db_num_rows($result);
 			print "Processed $processed articles...\n";
 
-			} else {
+			if (db_num_rows($result) != $limit) {
 				echo "All done.\n";
 				break;
 			}
-
 		}
-
 	}
 
 	if (isset($options["list-plugins"])) {