fix(done): Mark card as undone when updating card

As stated in #534 (comment) updating the done property of a card via the REST API (without calling the /done and /undone endpoints explicitly) does only work "one way".

This commit allows setting null as new value thus allowing to mark cards as undone without an additional HTTP request but within a usual update request.

Refs: #534 #4137 c3b4ed6

Signed-off-by: Stefan Niedermann <info@niedermann.it>

Signed-off-by: Niedermann IT-Dienstleistungen <stefan-niedermann@users.noreply.github.com>

lib/Service/CardService.php

@@ -355,6 +355,8 @@ public function update($id, $title, $stackId, $type, $owner, $description = '',
 		}
 		if ($done !== null) {
 			$card->setDone($done->getValue());
+		} else {
+			$card->setDone(null);
 		}