`trace`: improve error handling and error messages. #13811

Job	Run time
Check Code Changes / check_files	14s
get-torch-commit	2s
Build PyTorch/XLA / build	24m 44s
CPU tests / test (python_tests, xla_op3)	12m 6s
CPU tests / test (python_tests, xla_op2)	7m 32s
CPU tests / test (benchmark_tests)	10m 19s
CPU tests / test (python_tests, xla_op4)	4m 47s
CPU tests / test (python_tests, xla_op5)	6m 35s
TPU tests / tpu-test (test/tpu/run_expensive_test_1.sh)	26m 18s
CPU tests / test (python_tests, xla_op1)	16m 1s
CPU tests / test (python_tests, torch_mp_op)	8m 2s
TPU tests / tpu-test (test/tpu/run_pallas_test.sh)	6m 7s
CPU tests / test (cpp_tests)	12m 19s
TPU tests / tpu-test (test/tpu/run_expensive_test_2.sh)	27m 18s
TPU tests / tpu-test (test/tpu/run_tests.sh)	27m 24s
TPU tests / tpu-test (test/tpu/run_training_tests.sh)	16m 47s
torchprime tests	0s
Build docs	0s
	3h 26m 35s

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