Filter out files with no methods.

Author: neogeek

lib/doxdox.js

@@ -69,7 +69,7 @@ const parseFile = (input, config) =>
 const parseFiles = (files, config) => loaders.loadPlugin(setConfigDefaults(config)).then(plugin =>
     Promise.all(files.map(input => parseFile(input, config)))
         .then(files => plugin(Object.assign({
-            files
+            'files': files.filter(file => file.methods.length)
         }, setConfigDefaults(config)))));
 
 /**