onnxruntime

Fix invalid access in log call. (#8389)

Fix bug that shows up when running tests (in particular, GraphTransformationTests.ConcatSliceEliminationTest) with more verbose logging level.

There is a log statement that doesn't get evaluated at the default test logging level (warning). It was accessing the first element of an empty vector. This change moves that log statement before the point where that vector is cleared.