fix: Handle missing share providers when promoting reshares

The provider for mail shares is not available when the "sharebymail" app
is disabled, and in that case a "ProviderException" is thrown when
trying to get it.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

Author: danxuliu

lib/private/Share20/Manager.php

@@ -1065,7 +1065,12 @@ protected function promoteReshares(IShare $share): void {
 
 		foreach ($userIds as $userId) {
 			foreach ($shareTypes as $shareType) {
-				$provider = $this->factory->getProviderForType($shareType);
+				try {
+					$provider = $this->factory->getProviderForType($shareType);
+				} catch (ProviderException $e) {
+					continue;
+				}
+
 				if ($node instanceof Folder) {
 					/* We need to get all shares by this user to get subshares */
 					$shares = $provider->getSharesBy($userId, $shareType, null, false, -1, 0);