avoid object creation if there is no rc file

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -363,7 +363,6 @@ def railsrc(argv)
         end
 
         def read_rc_file(railsrc)
-          return [] unless File.exists?(railsrc)
           extra_args_string = File.read(railsrc)
           extra_args = extra_args_string.split(/\n+/).map {|l| l.split}.flatten
           puts "Using #{extra_args.join(" ")} from #{railsrc}"
@@ -371,6 +370,7 @@ def read_rc_file(railsrc)
         end
 
         def insert_railsrc_into_argv!(argv, railsrc)
+          return argv unless File.exists?(railsrc)
           extra_args = read_rc_file railsrc
           argv.take(1) + extra_args + argv.drop(1)
         end