From b6a8798354125d3df2f0de8cb516938a2b829286 Mon Sep 17 00:00:00 2001
From: Andrew Nicolaou <andrew.nicolaou@bbc.co.uk>
Date: Wed, 25 Sep 2013 15:12:09 +0100
Subject: [PATCH] Run block only if given (to match Readme behaviour)

---
 lib/wiringpi/gpio.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/wiringpi/gpio.rb b/lib/wiringpi/gpio.rb
index 92d929a..a899310 100644
--- a/lib/wiringpi/gpio.rb
+++ b/lib/wiringpi/gpio.rb
@@ -9,7 +9,7 @@ class GPIO
     def initialize(&block)
       Wiringpi2.wiringPiSetup
       @pins = Array.new
-      instance_eval &block
+      instance_eval &block if block_given?
     end
 
     def read_byte(starting_pin)