Error while parsing frontmatter having sub items

[ooker777]

For files having this YAML:

---
a:
  - b
---

It will have this error:

Traceback (most recent call last):
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\metadata.py", line 356, in _parse_1
    fm = frontmatter.loads(note_content)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ganuo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\frontmatter\__init__.py", line 165, in loads
    metadata, content = parse(text, encoding, handler, **defaults)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ganuo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\frontmatter\__init__.py", line 82, in parse
    fm = handler.load(fm)
         ^^^^^^^^^^^^^^^^
  File "C:\Users\ganuo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\frontmatter\default_handlers.py", line 238, in load
    return yaml.load(fm, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ganuo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\yaml\__init__.py", line 81, in load
    return loader.get_single_data()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ganuo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\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 845, in yaml._yaml.CParser._compose_mapping_node
  File "yaml\_yaml.pyx", line 694, in yaml._yaml.CParser._compose_node
  File "yaml\_yaml.pyx", line 860, in yaml._yaml.CParser._parse_next_event
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1
could not find expected ':'
  in "<unicode string>", line 4, column 1

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\note.py", line 39, in __init__
    self.metadata: NoteMetadata = NoteMetadata(self.content)
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\metadata.py", line 698, in __init__
    self.frontmatter = Frontmatter(note_content)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\metadata.py", line 67, in __init__
    self.metadata: MetaDict = self._parse(note_content)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\metadata.py", line 349, in _parse
    return parse_fn(note_content)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\metadata.py", line 358, in _parse_1
    raise InvalidFrontmatterError(exception=e) from e
pyomd.exceptions.InvalidFrontmatterError: Error while parsing frontmatter!. Exception:
while scanning a simple key
  in "<unicode string>", line 3, column 1
could not find expected ':'
  in "<unicode string>", line 4, column 1

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "D:\QC supplements\Vaults\C Nhóm hỗ trợ người tự học\Obsidian, quản lý dự án và công cụ nghĩ\Thiết lập\test.py", line 14, in <module>
    allnotes = Notes(path_dir)
               ^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\note.py", line 166, in __init__
    self.add(paths=paths, recursive=recursive)
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\note.py", line 193, in add
    self.notes.append(Note(path=pth_f))
                      ^^^^^^^^^^^^^^^^
  File "D:\Programming\Obsidian\py-obsidianmd\pyomd\note.py", line 41, in __init__
    raise ParsingNoteMetadataError(path=path, exception=e) from e
pyomd.exceptions.ParsingNoteMetadataError: Error while parsing metadata for note at path: "D:\QC supplements\Vaults\C Nhóm hỗ trợ người tự học\Obsidian, quản lý dự án và công cụ nghĩ\🌟 BẮT ĐẦU Ở ĐÂY.md". Exception:
Error while parsing frontmatter!. Exception:
while scanning a simple key
  in "<unicode string>", line 3, column 1
could not find expected ':'
  in "<unicode string>", line 4, column 1

Command:

from pathlib import Path
from pyomd import Notes
from pyomd.metadata import MetadataType

path_dir = Path('D:\QC supplements\Vaults\C Nhóm hỗ trợ người tự học\Obsidian, quản lý dự án và công cụ nghĩ')
allnotes = Notes(path_dir)