平台订单：同步失败原因TOP5空原因降级不渲染链接

resources/views/admin/platform_orders/index.blade.php

@@ -244,7 +244,7 @@
                         $count = (int) ($item['count'] ?? 0);
                     @endphp
                     <div>
-                        @if($reason !== '')
+                        @if($reason !== '' && $reason !== '（空）')
                             @php $reasonText = mb_substr($reason, 0, 60); @endphp
                             <a class="link" title="{{ $reason }}" href="{!! request()->fullUrlWithQuery(['sync_error_keyword' => $reason, 'sync_status' => 'failed', 'page' => null]) !!}">{{ $reasonText }}</a>
                             <span class="muted">（{{ $count }}）</span>

tests/Feature/AdminPlatformOrderSyncFailedReasonTop5EmptyReasonFallbackTest.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderSyncFailedReasonTop5EmptyReasonFallbackTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_sync_failed_reason_top5_empty_reason_should_fallback_and_not_render_link(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'sync_failed_reason_empty_reason_test',
+            'name' => '同步失败原因空字符串降级测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        // 构造空失败原因（message 为空字符串），确保 TOP5 渲染时走降级展示
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_SYNC_FAILED_EMPTY_REASON_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+            'meta' => [
+                'subscription_activation_error' => [
+                    'message' => '',
+                    'at' => now()->toDateTimeString(),
+                    'admin_id' => 1,
+                ],
+            ],
+        ]);
+
+        $page = $this->get('/admin/platform-orders');
+        $page->assertOk();
+
+        $page->assertSee('（空原因）');
+
+        // 空原因不应生成“失败原因链接”或“切到可同步重试”链接
+        $page->assertDontSee('切到可同步重试', false);
+        $page->assertDontSee('sync_error_keyword=', false);
+    }
+}