Fixed bug causing SvgFont objects to be drawn as if they were ordinary paths.

Source/Text/SvgFont.cs

@@ -51,5 +51,8 @@ namespace Svg
         {
             return base.DeepCopy<SvgFont>();
         }
-    }
+
+        protected override void Render(ISvgRenderer renderer)
+        { }
+	}
 }