Merge pull request #5082 from annando/federation-warning

Avoid warning when no valid data could be read

src/Protocol/PortableContact.php

@@ -1527,10 +1527,12 @@ class PortableContact
 		if ($serverdata) {
 			$servers = json_decode($serverdata);
 
+			if (is_array($servers->pods)) {
 				foreach ($servers->pods as $server) {
 					Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://".$server->host);
 				}
 			}
+		}
 
 		// Disvover Mastodon servers
 		if (!Config::get('system', 'ostatus_disabled')) {