fix: respect status 0 (DRAFT) when adding new signers

When adding a new signer with status 0, the backend was ignoring it
because empty() treated 0 as falsy. Changed to isset() to properly
handle status 0.

Also updated determineInitialStatus() to allow new signers to be
added in DRAFT mode even when the file is not in DRAFT status,
allowing gradual signer addition before requesting signatures.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Service/RequestSignatureService.php

@@ -53,7 +53,7 @@ public function __construct(
 	public function save(array $data): FileEntity {
 		$file = $this->saveFile($data);
 		$this->saveVisibleElements($data, $file);
-		if (empty($data['status'])) {
+		if (!isset($data['status'])) {
 			$data['status'] = $file->getStatus();
 		}
 		$this->associateToSigners($data, $file->getId());
@@ -289,6 +289,8 @@ private function associateToSigner(
 	}
 
 	private function determineInitialStatus(int $signingOrder, ?int $fileStatus = null): \OCA\Libresign\Enum\SignRequestStatus {
+		// If fileStatus is explicitly DRAFT (0), keep signer as DRAFT
+		// This allows adding new signers in DRAFT mode even when file is not in DRAFT status
 		if ($fileStatus === FileEntity::STATUS_DRAFT) {
 			return \OCA\Libresign\Enum\SignRequestStatus::DRAFT;
 		}