Fix issue where blank summary resulted in unescaped xmldoc being displayed
Fix issue where blank summary resulted in unescaped xmldoc being displayed

fsharp/xamarin-monodevelop-fsharp-addin,nosami/xamarin-monodevelop-fsharp-addin,nosami/xamarin-monodevelop-fsharp-addin,fsharp/xamarin-monodevelop-fsharp-addin