Added sentence exception test in script.

WetPancake/Script.fsx

@@ -80,12 +80,19 @@ let dp_combine4 =
     let prev = "Next is null"
     let next = null
     CombineWords prev next
-let dp_invalidGibberish =
+let dp_gibberishException =
     try
-        GibberishLevelIsValid 0
+        GibberishLevelIsValid 0 // enter a number here
         |> ignore
         "No exception thrown"
     with :? ArgumentException as ex -> ex.Message
+let dp_sentencesException =
+    try
+        SentencesIsValid 0 // enter a number here
+        |> ignore
+        "No exception thrown"
+    with :? ArgumentException as ex ->
+        ex.Message