chore(core): remove always valid test

Increase coverage

Author: medfreeman

src/configManager.js

@@ -69,9 +69,7 @@ class ConfigManager {
       collections: []
     };
 
-    if (configObject.media_folder) {
-      newConfig.media_folder = join(enforcedPath, configObject.media_folder);
-    }
+    newConfig.media_folder = join(enforcedPath, configObject.media_folder);
 
     if (configObject.collections) {
       configObject.collections.forEach(function(collection) {