Merge pull request #756 from nextcloud/twofactor-isset-10

[10] Check if an app provide two-factor-auth providers before we try to use them

lib/private/Authentication/TwoFactorAuth/Manager.php

@@ -109,6 +109,7 @@ class Manager {
 
 		foreach ($allApps as $appId) {
 			$info = $this->appManager->getAppInfo($appId);
+			if (isset($info['two-factor-providers'])) {
 				$providerClasses = $info['two-factor-providers'];
 				foreach ($providerClasses as $class) {
 					try {
@@ -121,6 +122,7 @@ class Manager {
 					}
 				}
 			}
+		}
 
 		return array_filter($providers, function ($provider) use ($user) {
 			/* @var $provider IProvider */