fix logging error in puppet_command

bin/puppet_command

@@ -64,11 +64,13 @@ def log(str, *args)
   str = str.strip
   $stdout.puts str
   $stdout.flush
+  if $logger
     $logger.info(str)
     if args.include? :summary
       $summary_logger.info(str)
     end
   end
+end
 
 def process_command_line_arguments
   @commands = []