Guests cannot create public links

[LostinSpacetime]

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Steps to reproduce

1. Login as guest
2. Open the share dialog
3. Create a public link

Expected behaviour

A link should be created

Actual behaviour

Error: OCA\Guests\Service\InviteService::sendInvite(): Argument #2 ($guest) must be of type string, null given

The fix is rather simple. In Hooks.php change:

$shareWith = $share->getSharedWith();
$isGuest = $this->guestManager->isGuest($shareWith);

to:

$shareWith = $share->getSharedWith();
if ($shareWith === null) {
return;
}
$isGuest = $this->guestManager->isGuest($shareWith);