BE expose has_approval_rules

ee/app/models/approval_state.rb

@@ -35,6 +35,10 @@ class ApprovalState
     end
   end
 
+  def has_approval_rules?
+    !wrapped_approval_rules.empty?
+  end
+
   def approval_rules_overwritten?
     merge_request.approval_rules.any?(&:regular?)
   end

ee/lib/ee/api/entities.rb

@@ -378,6 +378,10 @@ module EE
         expose :approval_rules_left do |approval_state, options|
           approval_state.approval_rules_left.map(&:name)
         end
+
+        expose :has_approval_rules do |approval_state|
+          approval_state.has_approval_rules?
+        end
       end
 
       class LdapGroup < Grape::Entity