Guid parse fix

Author: Thorium

src/SQLProvider.Fable.Core/SqlValue.fs

@@ -257,7 +257,6 @@ module Convert =
         if String.IsNullOrEmpty s then
             None
         else
-            try
-                Some(Guid.Parse s)
-            with _ ->
-                None
+            match Guid.TryParse s with
+            | true, v -> Some v
+            | false, _ -> None