fix(appmanager): ignore null appinfo

[ArtificialOwl]

fix regression from #52777

since the key core in $this->appinfos[] generated in getAppInfo() is NULL, we have this in the logs:

{
"level": 2,
"method": "GET",
"url": "/index.php/settings/admin/security",
"message": "foreach() argument must be of type array|object, null given at /home/maxence/sites/nc32/nextcloud/lib/private/App/AppManager.php#926",
"version": "32.0.0.1",
"data": {
"app": "PHP"
}
}

[susnux]

Where is it set to null? I do not really get where core comes into play

[ArtificialOwl]

Where is it set to null? I do not really get where core comes into play

1. the list of apps sent to registerApps() now includes 'core': 7fe272f

2. during the process of buildAppNamespace, we get details from the app using IAppManager::getAppInfo():

   server/lib/private/AppFramework/App.php

   Line 49 in 9913bdd

   $appInfo = \OCP\Server::get(IAppManager::class)->getAppInfo($appId);

3. getAppInfoByPath() store a null value for the array key 'code' of $this->appInfos because we have no file core/appinfo/info.xml:
   

   server/lib/private/App/AppManager.php

   Lines 756 to 762 in 1f5e232

   	$data = $this->getAppInfoByPath($file, $lang);
   	if ($lang === null) {
   	$this->appInfos[$appId] = $data;
   	}
   	return$data;

[ArtificialOwl]

fixed by #54541