Sanitize the addon author if it is not a valid URL but a handle

src/Core/Addon.php

@@ -23,6 +23,7 @@ namespace Friendica\Core;
 
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Util\Strings;
 
 /**
@@ -257,6 +258,12 @@ class Addon
 					if ($type == "author" || $type == "maintainer") {
 						$r = preg_match("|([^<]+)<([^>]+)>|", $v, $m);
 						if ($r) {
+							if (!empty($m[2]) && empty(parse_url($m[2], PHP_URL_SCHEME))) {
+								$contact = Contact::getByURL($m[2], false);
+								if (!empty($contact['url'])) {
+									$m[2] = $contact['url'];
+								}
+							}
 							$info[$type][] = ['name' => $m[1], 'link' => $m[2]];
 						} else {
 							$info[$type][] = ['name' => $v];