update_rss_feed: misc fixes

functions.php

@@ -772,10 +772,12 @@
 				if ($use_simplepie) {
 					$links = $rss->get_links('hub');
 
+					if ($links && is_array($links)) {
 						foreach ($links as $l) {
 							$feed_hub_url = $l;
 							break;
 						}
+					}
 
 				} else {
 					$atom = $rss->channel['atom'];
@@ -789,6 +791,7 @@
 							for ($i = 2; $i <= $atom['link#']; $i++) {
 								if ($atom["link#$i@rel"] == 'hub') {
 									$feed_hub_url = $atom["link#$i@href"];
+									break;
 								}
 							}
 						}