Fix handling of ExecutionException

We should not unwrap the cause one time too many.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

src/main/java/com/carrotsearch/junitbenchmarks/BenchmarkStatement.java

@@ -256,8 +256,7 @@ public Result evaluate() throws Throwable
             catch (ExecutionException e)
             {
                 // Unwrap the Throwable thrown by the tested method.
-                e.printStackTrace();
-                throw e.getCause().getCause();
+                throw e.getCause();
             }
             finally
             {