chore: add warning in case of failure

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

lib/private/App/AppStore/Fetcher/AppFetcher.php

@@ -178,6 +178,7 @@ public function get($allowUnstable = false) {
 
 		$apps = parent::get($allowPreReleases);
 		if (empty($apps)) {
+			$this->logger->warning('Could not get apps from the appstore', ['app' => 'appstoreFetcher']);
 			return [];
 		}
 		$allowList = $this->config->getSystemValue('appsallowlist');