Make the `.message` field on exceptions non-empty #521

Job	Run time
Linux / Python 3.8 / tox -e security	32s
Linux / Python 3.9 / tox -e security	18s
Linux / Python 3.10 / tox -e security	28s
Linux / Python 3.11 / tox -e security	25s
Linux / Python 3.10 / tox -e lint	26s
Linux / Python 3.8 / tox -e type-checking	19s
Linux / Python 3.9 / tox -e type-checking	11s
Linux / Python 3.10 / tox -e type-checking	48s
Linux / Python 3.11 / tox -e type-checking	47s
Linux / Python 3.8 / tox -e py38	51s
Linux / Python 3.8 / tox -e py38-no-ext	50s
Linux / Python 3.9 / tox -e py39	17s
Linux / Python 3.9 / tox -e py39-no-ext	51s
Linux / Python 3.10 / tox -e py310	52s
Linux / Python 3.10 / tox -e py310-no-ext	51s
Linux / Python 3.11 / tox -e py311	52s
Linux / Python 3.12 / tox -e py312	52s
Linux / Python 3.11 / tox -e py311-no-ext	51s
Windows / Python 3.8 / tox -e py38-no-ext	49s
Windows / Python 3.9 / tox -e py39-no-ext	24s
Windows / Python 3.10 / tox -e py310-no-ext	48s
Windows / Python 3.11 / tox -e py310-no-ext	50s
	14m 12s

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