fix the contacts-menu vcf-contact avatars

Signed-off-by: Simon L <szaimen@e.mail.de>

Author: szaimen

lib/private/Contacts/ContactsMenu/ContactsStore.php

@@ -287,8 +287,15 @@ private function contactArrayToEntry(array $contact): Entry {
 		if (isset($contact['UID'])) {
 			$uid = $contact['UID'];
 			$entry->setId($uid);
-			$avatar = $this->urlGenerator->linkToRouteAbsolute('core.avatar.getAvatar', ['userId' => $uid, 'size' => 64]);
-			$entry->setAvatar($avatar);
+			$avatar = '';
+			if ($this->userManager->userExists($uid)) {
+				$avatar = $this->urlGenerator->linkToRouteAbsolute('core.avatar.getAvatar', ['userId' => $uid, 'size' => 64]);
+			} elseif (isset($contact['FN'])) {
+				$avatar = $this->urlGenerator->linkToRouteAbsolute('core.GuestAvatar.getAvatar', ['guestName' => $contact['FN'], 'size' => 64]);
+			}
+			if ($avatar !== '') {
+				$entry->setAvatar($avatar);
+			}
 		}
 
 		if (isset($contact['FN'])) {