Prevent pulse crash when it is not configured

app/Providers/AppServiceProvider.php

@@ -74,6 +74,7 @@ class AppServiceProvider extends ServiceProvider
             return $user->is_admin === 1;
         });
 
+        if (config('pulse.enabled', false)) {
             Pulse::user(function ($user) {
                 $acct = AccountService::get($user->profile_id, true);
 
@@ -87,6 +88,7 @@ class AppServiceProvider extends ServiceProvider
                     'avatar' => '/storage/avatars/default.jpg',
                 ];
             });
+        }
 
         RateLimiter::for('app-signup', function (Request $request) {
             return Limit::perDay(10)->by($request->ip());