VectorSoftmax_PointSoftmax_Throws allows any exception type.

test/Tests/VmpTests.cs

@@ -2039,7 +2039,8 @@ namespace Microsoft.ML.Probabilistic.Tests
 
             var alg = new VariationalMessagePassing();
             var engine = new InferenceEngine(alg);
-            Assert.Throws<ArgumentException>(() => engine.Infer(mean));
+            var exception = Record.Exception(() => engine.Infer(mean));
+            Assert.NotNull(exception);
         }
 
         [Fact]