ParserError exception raised for invalid configuration

[CarstenGrohmann]

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ParserError and unicode

describe your issue

I executed pre-commit autoupdate with an invalid configuration file (the second - repo is indented incorrectly) and got this error message:

$ pre-commit autoupdate
An unexpected error has occurred: ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1
did not find expected key
  in "<unicode string>", line 7, column 1
Check the log at /home/carsten/.cache/pre-commit/pre-commit.log

This is an expected error and I would expect an error message like `Your configuration file "..." is wrongly formatted at . Please review the format of the content.'.

Thank you,
Carsten

pre-commit --version

pre-commit 2.21.0

.pre-commit-config.yaml

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.4.0
    hooks:
      - id: check-executables-have-shebangs

- repo: https://github.com/shellcheck-py/shellcheck-py
    rev: v0.9.0.2
    hooks:
    -   id: shellcheck

~/.cache/pre-commit/pre-commit.log (if present)

version information

pre-commit version: 2.21.0
git --version: git version 2.35.3
sys.version:
    3.10.8 (main, Oct 28 2022, 17:28:32) [GCC]
sys.executable: /home/carsten/virtualenv/bin/python3.10
os.name: posix
sys.platform: linux

error information

An unexpected error has occurred: ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1
did not find expected key
  in "<unicode string>", line 7, column 1

Traceback (most recent call last):
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/pre_commit/error_handler.py", line 73, in error_handler
    yield
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/pre_commit/main.py", line 355, in main
    return autoupdate(
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/pre_commit/commands/autoupdate.py", line 154, in autoupdate
    migrate_config(config_file, quiet=True)
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/pre_commit/commands/migrate_config.py", line 47, in migrate_config
    contents = _migrate_map(contents)
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/pre_commit/commands/migrate_config.py", line 16, in _migrate_map
    if isinstance(yaml_load(contents), list):
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/yaml/__init__.py", line 81, in load
    return loader.get_single_data()
  File "/home/carsten/virtualenv/lib64/python3.10/site-packages/yaml/constructor.py", line 49, in get_single_data
    node = self.get_single_node()
  File "yaml/_yaml.pyx", line 673, in yaml._yaml.CParser.get_single_node
  File "yaml/_yaml.pyx", line 687, in yaml._yaml.CParser._compose_document
  File "yaml/_yaml.pyx", line 731, in yaml._yaml.CParser._compose_node
  File "yaml/_yaml.pyx", line 847, in yaml._yaml.CParser._compose_mapping_node
  File "yaml/_yaml.pyx", line 860, in yaml._yaml.CParser._parse_next_event
yaml.parser.ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1
did not find expected key
  in "<unicode string>", line 7, column 1