Handle missing Datasource with GlassView

NoDatasourceSafeViewRenderer.cs

using System;
using Sitecore.Mvc.Presentation;

namespace Diversus.Core.Sitecore.ViewRenderers
{
    /// <summary>
    /// GlassView ViewRenderings require a datasource, gracefully handle when they do not (i.e. Sitecore will try to pass in a RenderingModel when no model is found).
    /// Handles the error: "The model item passed into the dictionary is of type 'Sitecore.Mvc.Presentation.RenderingModel', but this dictionary requires a model item of type XXXX"
    /// </summary>
    public class NoDatasourceSafeViewRenderer : ViewRenderer
    {
        public override void Render(System.IO.TextWriter writer)
        {
            try
            {
                //try to render as Views that aren't GlassView ViewRenderings might not require a Datasource
                base.Render(writer); 
            }
            catch (InvalidOperationException ex)
            {
                //If pagemode is normal then return nothing
                if (global::Sitecore.Context.PageMode.IsNormal)
                {                    
                }
                else
                {
                    //In Experience Editor mode, render a message in a div
                    writer.Write("<div class='view-render-exception'>");
                    writer.Write("<strong>No Datasource specified</strong>");
                    writer.Write("</div>");
                }
            }
        }

    }
}