fix phpstan errors

phpstan.neon

@@ -51,6 +51,10 @@ parameters:
         - '#Method Stancl\\Tenancy\\Tenancy::cachedResolvers\(\) should return array#'
         - '#Access to an undefined property Stancl\\Tenancy\\Middleware\\IdentificationMiddleware\:\:\$tenancy#'
         - '#Access to an undefined property Stancl\\Tenancy\\Middleware\\IdentificationMiddleware\:\:\$resolver#'
+        -
+            message: '#string\|false#'
+            paths:
+                - src/Controllers/TenantAssetController.php
 
     checkMissingIterableValueType: false
     checkGenericClassInNonGenericObjectType: false # later we may want to enable this

src/Controllers/TenantAssetController.php

@@ -57,7 +57,8 @@ class TenantAssetController implements HasMiddleware // todo@docs this was renam
         $this->abortIf(! str($attemptedPath)->startsWith($allowedRoot), 'Accessing a file outside the storage root');
     }
 
-    protected function abortIf($condition, $exceptionMessage): void
+    /** @return void|never */
+    protected function abortIf(bool $condition, string $exceptionMessage = ''): void
     {
         if ($condition) {
             if (app()->runningUnitTests()) {