add/refactor normalize_pod_services so configured services is always defined regardless if SERVICES are set up

app/models/app_config.rb

@@ -107,14 +107,13 @@ HELP
   end
 
   def self.normalize_pod_services
+    self['configured_services'] = []
     if defined?(SERVICES)
-      configured_services = []
       SERVICES.keys.each do |service|
         unless SERVICES[service].keys.any?{|service_key| SERVICES[service][service_key].blank?}
-          configured_services << service
+          self['configured_services'] << service
         end
       end
-      self['configured_services'] = configured_services
     end
   end
 

spec/models/app_config_spec.rb

@@ -175,6 +175,22 @@ describe AppConfig do
     end
   end
 
+  describe '.normalize_services' do
+    before do
+      @services = SERVICES
+      Object.send(:remove_const, :SERVICES)
+    end
+
+    after do
+      SERVICES = @services
+    end
+
+    it 'sets configured_services to an empty array if SERVICES is not defined' do
+      AppConfig.normalize_pod_services
+      AppConfig.configured_services.should == []
+    end
+  end
+
   describe ".[]=" do
     describe "when setting pod_url" do
       context "with a symbol" do