Make the `.message` field on exceptions non-empty #517

Job	Run time
Linux / Python 3.8 / tox -e security	30s
Linux / Python 3.9 / tox -e security	13s
Linux / Python 3.10 / tox -e security	28s
Linux / Python 3.11 / tox -e security	26s
Linux / Python 3.10 / tox -e lint	29s
Linux / Python 3.8 / tox -e type-checking	43s
Linux / Python 3.9 / tox -e type-checking	13s
Linux / Python 3.10 / tox -e type-checking	46s
Linux / Python 3.11 / tox -e type-checking	44s
Linux / Python 3.8 / tox -e py38	48s
Linux / Python 3.8 / tox -e py38-no-ext	46s
Linux / Python 3.9 / tox -e py39	48s
Linux / Python 3.9 / tox -e py39-no-ext	13s
Linux / Python 3.10 / tox -e py310	48s
Linux / Python 3.10 / tox -e py310-no-ext	48s
Linux / Python 3.11 / tox -e py311	49s
Linux / Python 3.12 / tox -e py312	48s
Linux / Python 3.11 / tox -e py311-no-ext	49s
Windows / Python 3.8 / tox -e py38-no-ext	55s
Windows / Python 3.9 / tox -e py39-no-ext	8s
Windows / Python 3.10 / tox -e py310-no-ext	45s
Windows / Python 3.11 / tox -e py310-no-ext	45s
	13m 42s

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