FNAC: why are the mappings blank?
If you are not a 'qualified seller' (and / or didn't enable this setting on the Setup page) a lot of features of FNAC are not available. This includes any content creation or updating. Therefore if this setting is not enabled, you will not see any products on the 'Content mappings' page even though you created a product selection and categorised these products.
If you are a qualified seller but are not seeing the mappings, please check if the checkbox displayed above is checked (and saved).