remove stray newline in error message produced by PyTorch easyblock

[Flamefire]

(created using eb --new-pr)

Follow-up to #3003 as the error looked odd:

== 2023-09-19 02:10:45,186 build_log.py:171 ERROR EasyBuild crashed with an error (at easybuild/base/exceptions.py:126 in __init__): 3 test failures, 1 test error (out of 129449):
Failed tests (suites/files):
test_quantization (997 total tests, failures=2, errors=1, skipped=74)
distributed/_tensor/test_dtensor_ops (637 total tests, skipped=36, expected failures=407, unexpected successes=1)
test_ops_gradients (1 failed, 1892 passed, 3055 skipped, 42 xfailed, 1 warning, 2 rerun)

+ test_cpp_extensions_jit (at easybuild/easyblocks/p/pytorch.py:430 in test_step)

This PR removes the empty line by building up a list of everything and joining it once and always.

[boegel]

@boegelbot please test @ generoso
EB_ARGS="PyTorch-1.13.1-foss-2022b.eb"
CORE_CNT=16

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=3005 EB_ARGS="PyTorch-1.13.1-foss-2022b.eb" EB_CONTAINER= EB_REPO=easybuild-easyblocks /opt/software/slurm/bin/sbatch --job-name test_PR_3005 --ntasks="16" ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 11786

Test results coming soon (I hope)...

Details

- notification for comment with ID 1737495529 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS PyTorch-1.13.1-foss-2022b.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
cnx1 - Linux Rocky Linux 8.5, x86_64, Intel(R) Xeon(R) CPU E5-2690 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/boegelbot/8b066aece99a1f92a1e07d6233ee8620 for a full test report.