Properly log expiration date removal in audit log

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/admin_audit/lib/Actions/Sharing.php

@@ -294,6 +294,16 @@ class Sharing extends Action {
 	 * @param array $params
 	 */
 	public function updateExpirationDate(array $params) {
+		if ($params['date'] === null) {
+			$this->log(
+				'The expiration date of the publicly shared %s with ID "%s" has been removed',
+				$params,
+				[
+					'itemType',
+					'itemSource',
+				]
+			);
+		} else {
 			$this->log(
 				'The expiration date of the publicly shared %s with ID "%s" has been changed to "%s"',
 				$params,
@@ -304,6 +314,7 @@ class Sharing extends Action {
 				]
 			);
 		}
+	}
 
 	/**
 	 * Logs access of shared files