Blit shader to RenderTexture results in solid black

I have set up a scene with a simple script that uses Blit to write to a RenderTexture:

 void Update()
  {
      Graphics.Blit(sourceTexture, this.renderTexture, material);
      RenderTexture.active = this.renderTexture;
  }

For some reason this works with most Materials/Shaders but it won't work with this cellular noise generating shader on this Material I've created. It just results in a solid black RenderTexture image.

The strange part is that the noise material/shader looks fine in the game and scene viewports.

I have included all of the files and the scene here: My Scene

Why isn't it rendering properly?