Add empty relevant css classes to css file

Targets/DiskUsage/DiskUsage-Custom.pm

@@ -1,10 +1,10 @@
 #
+# Generated by SM2Gen version:0.8 Chameleon version:4.5.4 On Python:3.12.3 at 2024-09-19 12:30:21 
+#
+#
 # Routines to be edited by the developer to provide validation for parameters
 # and provison of the control data for table(s)
 #
-# Generated by SM2Gen version:0.8 Chameleon version:4.5.4 On Python:3.12.3 at 2024-09-15 10:49 
-#
-
 use esmith::util;
 use esmith::HostsDB;
 use esmith::AccountsDB;