remove base error for the schemes (#790)

app/models/scheme.rb

@@ -214,7 +214,6 @@ class Scheme < ApplicationRecord
     if confirmed == true
       required_attributes.any? do |attribute|
         if self[attribute].blank?
-          errors.add :base
           errors.add attribute.to_sym
           self.confirmed = false
         end

config/locales/en.yml

@@ -65,8 +65,6 @@ en:
               invalid: "Select if this scheme provides for another client group"
             arrangement_type:
               invalid: "Select who provides the support services used by this scheme"
-            base:
-              invalid: "You must answer all the required questions for this scheme"
         location:
           attributes:
             startdate:

spec/requests/schemes_controller_spec.rb

@@ -586,7 +586,7 @@ RSpec.describe SchemesController, type: :request do
 
         it "does not allow the scheme to be confirmed" do
           expect(response).to have_http_status(:unprocessable_entity)
-          expect(page).to have_content(I18n.t("activerecord.errors.models.scheme.attributes.base.invalid"))
+          expect(page).to have_content(I18n.t("activerecord.errors.models.scheme.attributes.managing_organisation_id.invalid"))
         end
       end