Merge pull request #2117 from nextcloud/backport/2094/stable30

[stable30] fix: ignore empty expiration date

Author: sorbaugh

lib/Model/ShareWrapper.php

@@ -499,7 +499,10 @@ public function import(array $data): IDeserializable {
 		$this->importAttributesFromDatabase($this->get('attributes', $data));
 
 		try {
-			$this->setExpirationDate(new DateTime($this->get('expiration', $data)));
+			$expirationDate = $this->get('expiration', $data);
+			if ($expirationDate !== '') {
+				$this->setExpirationDate(new DateTime($expirationDate));
+			}
 		} catch (\Exception $e) {
 		}