=add file IO exception to GridPainter (dimensions) function

DeathSocket/GridPainter.fs

@@ -15,6 +15,7 @@ namespace DeathSocket
 
         open Validation
         open ImageServices
+        open System
 
         /// <summary>
         /// Uses the information included in spec to create a gridded image.
@@ -81,18 +82,25 @@ namespace DeathSocket
         let scaleLineThickness (previewDimension: double) (actualDimension: double) (lineThickness: double) =
             lineThickness / (previewDimension / actualDimension)
 
+        // NOT TESTED
+
         /// <summary>
         /// 
         /// </summary>
         /// <param name="imageType"></param>
         let determineImageDimensions imageType =
-            match imageType with
-            | SkiaSharp s ->
-                validateIO s |> ignore
-                determineSkiaDimensions s
-            | SystemDrawing d ->
-                validateIO d |> ignore
-                determineSystemDrawingDimensions d
+            try
+                match imageType with
+                | SkiaSharp s ->
+                    validateFilePath s |> ignore
+                    determineSkiaDimensions s
+                | SystemDrawing d ->
+                    validateFilePath d |> ignore
+                    determineSystemDrawingDimensions d
+            with
+            | :? FileNotFoundException as ex -> 
+                printfn "%s" ex.Message
+                (0,0)
 
         // System.Drawing Functions
         // ========================================================================