gh-103606: raise RuntimeError if config file is invalid or empty

[Agent-Hellboy]

• Issue: Unhelpful error message from logging.config.FileConfig can be improved #103606

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📚 Documentation preview 📚: https://cpython-previews--104701.org.readthedocs.build/

[gpshead]

thanks!

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot wasm32-emscripten node (pthreads) 3.x has failed when building commit 12f1581.

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/1050/builds/2070) and take a look at the build logs.
4. Check if the failure is related to this commit (12f1581) 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/1050/builds/2070

Failed tests:

• test_fileio

Failed subtests:

• testErrnoOnClosedTruncate - test.test_fileio.CAutoFileTests.testErrnoOnClosedTruncate

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

== Tests result: FAILURE ==

342 tests OK.

10 slowest tests:

• test_hashlib: 2 min 10 sec
• test_math: 1 min 32 sec
• test_tokenize: 1 min 20 sec
• test_tarfile: 54.7 sec
• test_lib2to3: 45.5 sec
• test_unparse: 45.4 sec
• test_io: 42.0 sec
• test_capi: 33.3 sec
• test_unicodedata: 29.9 sec
• test_fstring: 27.0 sec

1 test failed:
test_fileio

123 tests skipped:
test.test_asyncio.test_base_events
test.test_asyncio.test_buffered_proto
test.test_asyncio.test_context
test.test_asyncio.test_eager_task_factory
test.test_asyncio.test_events test.test_asyncio.test_futures
test.test_asyncio.test_futures2 test.test_asyncio.test_locks
test.test_asyncio.test_pep492
test.test_asyncio.test_proactor_events
test.test_asyncio.test_protocols test.test_asyncio.test_queues
test.test_asyncio.test_runners
test.test_asyncio.test_selector_events
test.test_asyncio.test_sendfile test.test_asyncio.test_server
test.test_asyncio.test_sock_lowlevel test.test_asyncio.test_ssl
test.test_asyncio.test_sslproto test.test_asyncio.test_streams
test.test_asyncio.test_subprocess
test.test_asyncio.test_taskgroups test.test_asyncio.test_tasks
test.test_asyncio.test_threads test.test_asyncio.test_timeouts
test.test_asyncio.test_transports
test.test_asyncio.test_unix_events test.test_asyncio.test_waitfor
test.test_asyncio.test_windows_events
test.test_asyncio.test_windows_utils test__xxinterpchannels
test__xxsubinterpreters test_asyncgen test_clinic test_cmd_line
test_concurrent_futures test_contextlib_async test_ctypes
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_doctest
test_docxmlrpc test_dtrace test_embed test_epoll test_faulthandler
test_fcntl test_file_eintr test_fork1 test_ftplib test_gdb
test_grp test_httplib test_httpservers test_idle test_imaplib
test_interpreters test_ioctl test_kqueue test_launcher test_lzma
test_mmap test_msilib test_multiprocessing_fork
test_multiprocessing_forkserver test_multiprocessing_main_handling
test_multiprocessing_spawn test_nis test_openpty test_ossaudiodev
test_pdb test_peg_generator test_perf_profiler test_poll
test_poplib test_pty test_pwd test_readline test_regrtest
test_repl test_resource test_select test_selectors test_smtplib
test_smtpnet test_socket test_socketserver test_spwd test_ssl
test_stable_abi_ctypes test_startfile test_subprocess
test_sys_settrace test_syslog test_tcl test_telnetlib test_tix
test_tkinter test_tools test_ttk test_ttk_textonly test_turtle
test_urllib2 test_urllib2_localnet test_urllib2net test_urllibnet
test_venv test_wait3 test_wait4 test_webbrowser test_winconsoleio
test_winreg test_winsound test_wmi test_wsgiref test_xmlrpc
test_xmlrpc_net test_xxlimited test_zipfile64
test_zipimport_support test_zoneinfo
0:27:19 load avg: 6.70
0:27:19 load avg: 6.70 Re-running failed tests is not supported with --python host runner option.

Total duration: 27 min 19 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 274, in wrapper
    self.assertEqual(e.errno, errno.EBADF)
AssertionError: 28 != 8


Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 272, in wrapper
    func(self, f)
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 302, in testErrnoOnClosedTruncate
    f.truncate(0)
OSError: [Errno 28] Invalid argument