Test multiple values with blank value

activerecord/lib/active_record/relation/query_methods.rb

@@ -1359,12 +1359,11 @@ def preprocess_order_args(order_args)
       end
 
       def sanitize_order_arguments(order_args)
-        order_args.compact_blank!
         order_args.map! do |arg|
           klass.sanitize_sql_for_order(arg)
         end
         order_args.flatten!
-        order_args
+        order_args.compact_blank!
       end
 
       def column_references(order_args)

activerecord/test/cases/relations_test.rb

@@ -2204,6 +2204,13 @@ def test_find_by_with_take_memoization
     assert_empty authors
   end
 
+  (ActiveRecord::Relation::MULTI_VALUE_METHODS - [:extending]).each do |method|
+    test "#{method} with blank value" do
+      authors = Author.public_send(method, [""])
+      assert_empty authors.public_send(:"#{method}_values")
+    end
+  end
+
   private
     def custom_post_relation(alias_name = "omg_posts")
       table_alias = Post.arel_table.alias(alias_name)