bin/overview in overview-0.0.3.56 vs bin/overview in overview-0.0.3.61

@@ -67,10 +67,10 @@
   c.desc 'Rubygem compatible version with build appended e.g. 0.1.1.534'
   c.switch :r
   c.desc 'Github token'
   c.flag :g
   c.action do |global_options,options,args|
-    ENV['GITHUB_TOKEN'] = options[:g]
+    ENV['GITHUB_TOKEN'] = options[:g] unless options[:g].nil?
     if options[:s]
       puts Overview::AppVersion.new.version(true).to_s
     elsif options[:b]
       puts Overview::AppVersion.new.build_no.to_s
     elsif options[:v]