Move the null check earlier to prevent setting up a parser for no rea…

…son.

src/Fieldtypes/Markdown.php

@@ -75,6 +75,10 @@ public function filter()
 
     public function augment($value)
     {
+        if (is_null($value)) {
+            return;
+        }
+
         $markdown = \Statamic\Facades\Markdown::parser(
             $this->config('parser', 'default')
         );
@@ -95,10 +99,6 @@ public function augment($value)
             $markdown = $markdown->withSmartPunctuation();
         }
 
-        if (is_null($value)) {
-            return;
-        }
-
         $html = $markdown->parse((string) $value);
 
         return $html;