if no population is added during add/remove components, you get an error message when you go to the next page (model-create/setdemand): Failed: You must first add a population type to this model
at least, error message should point you to the previous screen to add a population type. probably better if error message happens on the previous page, if you try to proceed without adding any population types.
if no population is added during add/remove components, you get an error message when you go to the next page (model-create/setdemand): Failed: You must first add a population type to this model
at least, error message should point you to the previous screen to add a population type. probably better if error message happens on the previous page, if you try to proceed without adding any population types.