Parsing error of recent_files.toml

[niv-gv]

Describe the bug

I came across an error, where some marimo tools that I created were not running, due to a defected recent_files.toml file.
I'm not sure what caused the file to be bad, and already removed it, but I do know that the code around line 37 in marimo/_utils/config/config.py tries to parse this file and only handles FileNotFoundError - it does not handle parsing errors, and apparently they happen.

Thank you, and here's the traceback of this error:

File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/marimo/_server/api/endpoints/ws.py", line 441, in get_sessi>
Jan 31 17:12:30 crete run_mpmt.sh[1701]: new_session = mgr.create_session(
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/marimo/_server/sessions.py", line 729, in create_session
Jan 31 17:12:30 crete run_mpmt.sh[1701]: self.recents.touch(app_file_manager.path)
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/marimo/_server/recents.py", line 42, in touch
Jan 31 17:12:30 crete run_mpmt.sh[1701]: state = self.config.read_toml(
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/marimo/_utils/config/config.py", line 37, in read_toml
Jan 31 17:12:30 crete run_mpmt.sh[1701]: data = tomlkit.parse(file.read())
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/tomlkit/api.py", line 91, in parse
Jan 31 17:12:30 crete run_mpmt.sh[1701]: return Parser(string).parse()
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/tomlkit/parser.py", line 139, in parse
Jan 31 17:12:30 crete run_mpmt.sh[1701]: item = self._parse_item()
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/tomlkit/parser.py", line 238, in _parse_item
Jan 31 17:12:30 crete run_mpmt.sh[1701]: return self._parse_key_value(True)
Jan 31 17:12:30 crete run_mpmt.sh[1701]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jan 31 17:12:30 crete run_mpmt.sh[1701]: File "/home/gvmarimo/.cache/pypoetry/virtualenvs/ml-pipeline-ZP2dUw9--py3.12/lib/python3.12/site-packages/tomlkit/parser.py", line 323, in _parse_key_value
Jan 31 17:12:30 crete run_mpmt.sh[1701]: raise self.parse_error(UnexpectedCharError, self._current)
Jan 31 17:12:30 crete run_mpmt.sh[1701]: tomlkit.exceptions.UnexpectedCharError: Unexpected character: ',' at line 2 col 43

Environment

{
  "marimo": "0.9.3",
  "OS": "Linux",
  "OS Version": "6.12.10-200.fc41.x86_64",
  "Processor": "",
  "Python Version": "3.12.8",
  "Binaries": {
    "Browser": "--",
    "Node": "v22.11.0"
  },
  "Dependencies": {
    "click": "8.1.7",
    "importlib-resources": "missing",
    "jedi": "0.19.1",
    "markdown": "3.7",
    "pygments": "2.18.0",
    "pymdown-extensions": "10.9",
    "ruff": "0.6.3",
    "starlette": "0.38.4",
    "tomlkit": "0.13.2",
    "typing-extensions": "4.12.2",
    "uvicorn": "0.30.6",
    "websockets": "12.0"
  },
  "Optional Dependencies": {
    "altair": "5.4.1",
    "pandas": "2.1.4",
    "polars": "1.6.0",
    "pyarrow": "15.0.2"
  }
}

Code to reproduce

No response