Upgrade umbraco to 7.5.4

WebCms/App_Start/HangfireStartup.cs

@@ -77,7 +77,7 @@ namespace LeafWeb.WebCms.App_Start
 				HostingEnvironment.RegisterObject(this);
 
 				// TODO: use Umbraco Connection string?
-				var cs = Umbraco.Core.ApplicationContext.Current.DatabaseContext.ConnectionString;
+				// var cs = Umbraco.Core.ApplicationContext.Current.DatabaseContext.ConnectionString;
 
 				GlobalConfiguration
 					.Configuration

WebCms/App_Start/RegisterServices.cs

@@ -9,6 +9,9 @@ namespace LeafWeb.WebCms.App_Start
 {
 	public class RegisterServices : ApplicationEventHandler
 	{
+		// TODO: after upgrading Umbraco, this might be helpful
+		// protected override bool ExecuteWhenApplicationNotConfigured => true;
+
 		protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
 		{
 			DataService.RegisterInitializer();