Properly set the Config object's @config variable when loading

lib/sauce/heroku/config.rb

@@ -20,12 +20,9 @@ module Sauce
 
       def load!
         return config unless config.nil?
+        return nil if filepath.nil?
 
-        if filepath.nil?
-          return nil
-        end
-
-        config = YAML.load_file(filepath)
+        @config = YAML.load_file(filepath)
       end
 
       def configured?

spec/sauce_spec.rb

@@ -30,7 +30,12 @@ describe Heroku::Command::Sauce do
 
   describe '#scout_url' do
     subject { command.send(:scout_url) }
+
     context 'when not configured' do
+      let(:config) { mock('Mock Config', :configured? => false) }
+      before :each do
+        command.instance_variable_set(:@config, config)
+      end
       it { should be_nil }
     end