In python versions <py3.10 there is an issue with an undocumented method
HTMLParser.error() [1][2] that was deprecated in Python 3.4 and removed
in Python 3.5.
To be compatible to higher versions (>=py3.10) an error method is implemented
which throws an AssertionError exception like the higher Python versions do [3].
[1] https://github.com/python/cpython/issues/76025
[2] https://bugs.python.org/issue31844
[3] https://github.com/python/cpython/pull/8562
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
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