Added accidently deleted ExceptionOnRazor.cshtml.

test/Volo.Abp.AspNetCore.Mvc.Tests/Volo/Abp/AspNetCore/App/Views/Simple/ExceptionOnRazor.cshtml

@@ -0,0 +1,5 @@
+@using Volo.Abp.Ui
+<h2>Exception test</h2>
+@{
+    throw new UserFriendlyException("test exception!");
+}