Merge branch 'stefanhenze-master'

Author: woodyrew

lib/index.js

@@ -6,8 +6,6 @@ var extname = require('path').extname;
 var join = require('path').join;
 var marked = require('marked');
 
-
-
 /**
  * Expose `plugin`.
  */
@@ -43,10 +41,12 @@ function plugin(options){
         data.contents = Buffer.from(str);
       } catch (err) {
         // node versions < (5.10 | 6)
-        data.contents = new Buffer(str);
+      data.contents = new Buffer(str);
       }
       keys.forEach(function(key) {
-        data[key] = marked(data[key].toString(), options);
+        if (data[key]) {
+          data[key] = marked(data[key].toString(), options);
+        }
       });
 
       delete files[file];