Update site-blank profile to have a /site/classes/ placeholder directory along with HomePage.php file as example/placeholder to ensure directory exists.

site-blank/classes/HomePage.php

@@ -0,0 +1,20 @@
+<?php namespace ProcessWire;
+
+/**
+ * Example custom page class for pages using template “home”
+ * 
+ * Feel free to delete this file if you do not want it. This is here as a
+ * placeholder to ensure the /site/classes/ directory exists.
+ * 
+ * When this file/class is present, page using template “home” will use this 
+ * class “HomePage” rather than class “Page”. You can do the same for any 
+ * other templates. For example, template “basic-page” would have a class 
+ * named “BasicPagePage” and template “admin” would have “AdminPage”, etc.
+ * 
+ * Custom page classes must extend class “Page”, or one derived from it. 
+ * 
+ * @property string $title
+ * 
+ */
+class HomePage extends Page {
+}