Use @Isset directive (#18817)

Author: tillkruss

src/Illuminate/Mail/resources/views/html/message.blade.php

@@ -10,13 +10,13 @@
     {{ $slot }}
 
     {{-- Subcopy --}}
-    @if (isset($subcopy))
+    @isset($subcopy)
         @slot('subcopy')
             @component('mail::subcopy')
                 {{ $subcopy }}
             @endcomponent
         @endslot
-    @endif
+    @endisset
 
     {{-- Footer --}}
     @slot('footer')

src/Illuminate/Mail/resources/views/markdown/layout.blade.php

@@ -1,9 +1,9 @@
 {!! strip_tags($header) !!}
 
 {!! strip_tags($slot) !!}
-@if (isset($subcopy))
+@isset($subcopy)
 
 {!! strip_tags($subcopy) !!}
-@endif
+@endisset
 
 {!! strip_tags($footer) !!}

src/Illuminate/Mail/resources/views/markdown/message.blade.php

@@ -10,13 +10,13 @@
     {{ $slot }}
 
     {{-- Subcopy --}}
-    @if (isset($subcopy))
+    @isset($subcopy)
         @slot('subcopy')
             @component('mail::subcopy')
                 {{ $subcopy }}
             @endcomponent
         @endslot
-    @endif
+    @endisset
 
     {{-- Footer --}}
     @slot('footer')

src/Illuminate/Notifications/resources/views/email.blade.php

@@ -17,7 +17,7 @@
 @endforeach
 
 {{-- Action Button --}}
-@if (isset($actionText))
+@isset($actionText)
 <?php
     switch ($level) {
         case 'success':
@@ -33,7 +33,7 @@
 @component('mail::button', ['url' => $actionUrl, 'color' => $color])
 {{ $actionText }}
 @endcomponent
-@endif
+@endisset
 
 {{-- Outro Lines --}}
 @foreach ($outroLines as $line)
@@ -49,10 +49,10 @@
 @endif
 
 <!-- Subcopy -->
-@if (isset($actionText))
+@isset($actionText)
 @component('mail::subcopy')
 If you’re having trouble clicking the "{{ $actionText }}" button, copy and paste the URL below
 into your web browser: [{{ $actionUrl }}]({{ $actionUrl }})
 @endcomponent
-@endif
+@endisset
 @endcomponent