fix(extend): 修复了解析不到为null不为数组的问题

src/Service/ExtendService.php

@@ -27,16 +27,14 @@ class ExtendService
         ?ServerRequestInterface $request,
         ?array $params = null
     ): array {
-        $params = $params ?? $request->getQueryParams();
-        $extends = $params['extends'] ?? null;
+        $params = $params ?? (isset($request) ? $request->getQueryParams() : null);
+        $extends = $params['extends'] ?? [];
         if (!empty($extends)) {
             $extends = explode(',', $extends);
             $extends = array_map('trim', $extends);
-            Context::set(self::class, $extends);
-            return $extends;
         }
-
-        return [];
+        Context::set(self::class, $extends);
+        return $extends;
     }
 
     /**

tests/Unit/ExtendServiceTest.php

@@ -15,6 +15,14 @@ use Singularity\HDK\Core\Service\UtilsService;
 
 /** @var ExtendService $service */
 $service = make(ExtendService::class, ['utils' => new UtilsService()]);
+it('asserts no parameters can be parsed.', function () use ($service) {
+    $service->parse(
+        null,
+        null
+    );
+    $result = $service->getExtends();
+    expect($result)->toBeArray()->toHaveCount(0)->toBe([]);
+})->only();
 it('asserts query parameters can be parsed.', function () use ($service) {
     $result = $service->parse(
         null,