Added check to see if template bundle file exists

uxcog.go

 
 	if isokit.OperatingEnvironment() == isokit.ServerEnvironment {
 
-		if isokit.UseStaticTemplateBundleFile == true {
+		if isokit.UseStaticTemplateBundleFile == true && isokit.StaticTemplateBundleFileExists() == true {
 			return
 		}