slapos_pdm: optional_variation_base_category_list are not set in variation_base_category_list

master/bt5/slapos_pdm/DocumentTemplateItem/portal_components/document.erp5_slapos.SoftwareProduct.py

@@ -56,7 +56,7 @@ class SoftwareProduct(ERP5SoftwareProduct):
   # valid type by default.
   content_type = ''
 
-  variation_base_category_list = ('software_release', 'software_type', )
+  variation_base_category_list = ('software_type', )
   optional_variation_base_category_list = ('software_release', )
 
   default_category_list = (