Make the `.message` field on exceptions non-empty #519

Job	Run time
Linux / Python 3.8 / tox -e security	32s
Linux / Python 3.9 / tox -e security	10s
Linux / Python 3.10 / tox -e security	34s
Linux / Python 3.11 / tox -e security	31s
Linux / Python 3.10 / tox -e lint	29s
Linux / Python 3.8 / tox -e type-checking	46s
Linux / Python 3.9 / tox -e type-checking	8s
Linux / Python 3.10 / tox -e type-checking	50s
Linux / Python 3.11 / tox -e type-checking	45s
Linux / Python 3.8 / tox -e py38	49s
Linux / Python 3.8 / tox -e py38-no-ext	49s
Linux / Python 3.9 / tox -e py39	49s
Linux / Python 3.9 / tox -e py39-no-ext	11s
Linux / Python 3.10 / tox -e py310	50s
Linux / Python 3.10 / tox -e py310-no-ext	49s
Linux / Python 3.11 / tox -e py311	47s
Linux / Python 3.12 / tox -e py312	50s
Linux / Python 3.11 / tox -e py311-no-ext	48s
Windows / Python 3.8 / tox -e py38-no-ext	48s
Windows / Python 3.9 / tox -e py39-no-ext	2s
Windows / Python 3.10 / tox -e py310-no-ext	51s
Windows / Python 3.11 / tox -e py310-no-ext	49s
	13m 57s

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