fix: error when seo installed but not enabled (#169)

* fix: error when seo installed but not enabled

* chore: remove unused imports

Author: imorland

composer.json

@@ -50,5 +50,8 @@
     "branch-alias": {
       "dev-master": "0.6.x-dev"
     }
+  },
+  "require-dev": {
+    "v17development/flarum-seo": "*"
   }
 }

src/Controller/BlogOverviewController.php

@@ -3,9 +3,7 @@
 namespace V17Development\FlarumBlog\Controller;
 
 use Flarum\Frontend\Document;
-use Flarum\Api\Controller\ListDiscussionsController;
 use Flarum\Api\Client;
-use Flarum\User\User;
 use Flarum\Extension\ExtensionManager;
 use Psr\Http\Message\ServerRequestInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
@@ -14,6 +12,21 @@
 
 class BlogOverviewController
 {
+    /**
+     * @var Client
+     */
+    protected $api;
+
+    /**
+     * @var TranslatorInterface
+     */
+    protected $translator;
+
+    /**
+     * @var ExtensionManager
+     */
+    protected $extensionManager;
+    
     public function __construct(Client $api, TranslatorInterface $translator, ExtensionManager $extensionManager)
     {
         $this->api = $api;
@@ -26,7 +39,7 @@ public function __invoke(Document $document, ServerRequestInterface $request)
         $queryParams = $request->getQueryParams();
 
         // Set meta tags
-        if(class_exists("V17Development\FlarumSeo\Extend")) {
+        if($this->extensionManager->isEnabled('v17development-seo') && class_exists("V17Development\FlarumSeo\Extend")) {
             // Get category
             if(Arr::get($queryParams, 'category')) {
                 $category = Tag::where('slug', Arr::get($queryParams, 'category'))->firstOrFail();