Update master.blade.php

未定义变量：alternate

Themes/Flatly/views/layouts/master.blade.php

@@ -7,9 +7,11 @@
     @show
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>@section('title')@setting('core::site-name')@show</title>
+    @if(isset($alternate))
         @foreach($alternate as $alternateLocale=>$alternateSlug)
             <link rel="alternate" hreflang="{{$alternateLocale}}" href="{{url($alternateLocale.'/'.$alternateSlug)}}">
         @endforeach
+    @endif
     <link rel="canonical" href="{{url()->current()}}" />
     <link rel="shortcut icon" href="{{ Theme::url('favicon.ico') }}">