Merge branch 'ouvrages-exclude_nil_links'

lib/active_model_serializers/adapter/json_api.rb

@@ -474,7 +474,8 @@ module ActiveModelSerializers
       #   }.reject! {|_,v| v.nil? }
       def links_for(serializer)
         serializer._links.each_with_object({}) do |(name, value), hash|
-          hash[name] = Link.new(serializer, value).as_json
+          result = Link.new(serializer, value).as_json
+          hash[name] = result if result
         end
       end
 

lib/active_model_serializers/adapter/json_api/link.rb

@@ -71,7 +71,7 @@ module ActiveModelSerializers
           hash[:href] = @href if defined?(@href)
           hash[:meta] = @meta if defined?(@meta)
 
-          hash
+          hash.any? ? hash : nil
         end
 
         protected