Make StyleCI happy and fix some docblocks

src/Admin/Controller/WebAppController.php

@@ -14,9 +14,7 @@ use Flarum\Admin\WebApp;
 use Flarum\Core\Permission;
 use Flarum\Event\PrepareUnserializedSettings;
 use Flarum\Extension\ExtensionManager;
-use Flarum\Foundation\Application;
 use Flarum\Http\Controller\AbstractWebAppController;
-use Flarum\Locale\LocaleManager;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Illuminate\Contracts\Events\Dispatcher;
 use Psr\Http\Message\ServerRequestInterface;

src/Asset/RevisionCompiler.php

@@ -97,7 +97,7 @@ class RevisionCompiler implements CompilerInterface
 
                 file_put_contents($file, $this->compile());
             } else {
-                return null;
+                return;
             }
         }
 

src/Forum/Controller/DiscussionController.php

@@ -12,8 +12,8 @@ namespace Flarum\Forum\Controller;
 
 use Flarum\Api\Client as ApiClient;
 use Flarum\Core\User;
-use Flarum\Forum\WebApp;
 use Flarum\Forum\UrlGenerator;
+use Flarum\Forum\WebApp;
 use Flarum\Http\Exception\RouteNotFoundException;
 use Illuminate\Contracts\Events\Dispatcher;
 use Psr\Http\Message\ServerRequestInterface as Request;

src/Http/WebApp/AbstractWebApp.php

@@ -10,7 +10,6 @@
 
 namespace Flarum\Http\WebApp;
 
-use Flarum\Http\Controller;
 use Flarum\Locale\LocaleManager;
 use Flarum\Settings\SettingsRepositoryInterface;
 

src/Http/WebApp/WebAppView.php

@@ -12,10 +12,7 @@ namespace Flarum\Http\WebApp;
 
 use Flarum\Api\Client;
 use Flarum\Api\Serializer\AbstractSerializer;
-use Flarum\Api\Serializer\CurrentUserSerializer;
 use Flarum\Asset\CompilerInterface;
-use Flarum\Core\Exception\ValidationException;
-use Flarum\Core\User;
 use Flarum\Locale\JsCompiler;
 use Flarum\Locale\LocaleManager;
 use Illuminate\View\Factory;
@@ -113,7 +110,7 @@ class WebAppView
     protected $localeCss;
 
     /**
-     * @var ClientAssets
+     * @var WebAppAssets
      */
     protected $assets;
 
@@ -139,7 +136,7 @@ class WebAppView
 
     /**
      * @param string $layout
-     * @param ClientAssets $assets
+     * @param WebAppAssets $assets
      * @param Client $api
      * @param Factory $view
      * @param LocaleManager $locales