bpo-45421: Remove dead code from html.parser

[mardy]

Support for HtmlParserError was removed back in 2014 with commit
73a4359, however this small block was
missed.

https://bugs.python.org/issue45421

[the-knights-who-say-ni]

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[methane]

Nice catch!

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 Windows 3.x has failed when building commit 562c0d7.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/729/builds/71) and take a look at the build logs.
4. Check if the failure is related to this commit (562c0d7) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/729/builds/71

Failed tests:

• test_regrtest

Summary of the results of the build (if available):

== Tests result: FAILURE then SUCCESS ==

389 tests OK.

10 slowest tests:

• test_multiprocessing_spawn: 3 min 30 sec
• test_peg_generator: 3 min 25 sec
• test_unparse: 2 min 54 sec
• test_tokenize: 2 min 45 sec
• test_concurrent_futures: 2 min 9 sec
• test_lib2to3: 1 min 48 sec
• test_asyncio: 1 min 40 sec
• test_unicodedata: 1 min 37 sec
• test_capi: 1 min 33 sec
• test_io: 1 min 7 sec

38 tests skipped:
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_epoll
test_fcntl test_fork1 test_gdb test_grp test_idle test_ioctl
test_kqueue test_multiprocessing_fork
test_multiprocessing_forkserver test_nis test_openpty
test_ossaudiodev test_pipes test_poll test_posix test_pty test_pwd
test_readline test_resource test_spwd test_syslog test_tcl
test_threadsignals test_tix test_tk test_ttk_guionly
test_ttk_textonly test_turtle test_wait3 test_wait4 test_xxlimited
test_xxtestfuzz test_zipfile64

1 re-run test:
test_regrtest

Total duration: 30 min 41 sec

Click to see traceback logs

Traceback (most recent call last):
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
    ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\__main__.py", line 2, in <module>
    main()
    ^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\libregrtest\main.py", line 736, in main
    Regrtest().main(tests=tests, **kwargs)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\libregrtest\main.py", line 652, in main
    with os_helper.temp_cwd(test_cwd, quiet=True):
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\contextlib.py", line 153, in __exit__


Traceback (most recent call last):
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\support\__init__.py", line 197, in _force_run
    return func(*args)
           ^^^^^^^^^^^
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Workspace\\buildarea\\3.x.linaro-win-arm64\\build\\build\\test_python_15812�\\test_python_worker_18720�'


Traceback (most recent call last):
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\support\os_helper.py", line 396, in temp_dir
    yield path
    ^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\support\os_helper.py", line 449, in temp_cwd
    yield cwd_dir
    ^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\libregrtest\main.py", line 658, in main
    self._main(tests, kwargs)
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Workspace\buildarea\3.x.linaro-win-arm64\build\lib\test\libregrtest\main.py", line 731, in _main
    sys.exit(0)
    ^^^^^^^^^^^
SystemExit: 0