Add empty line after tests

src/mlpack/tests/ann_layer_test.cpp

@@ -4128,4 +4128,4 @@ TEST_CASE("BatchNormDeterministicTest", "[ANNLayerTest]")
   module.Train(input, output);
   // The model should switch to training mode for predicting.
   REQUIRE(boost::get<BatchNorm<>*>(module.Model()[0])->Deterministic() == false);
-}
+}