[KiField Bug] AttributeError: 'Sheet_V6' object has no attribute 'filename

[matejkolin]

Describe the bug
Trying to extract field data from a schematic into a *.csv or *.xlsx format, have the same results for both

To Reproduce

1. Open windows power shell
2. Go to the folder containing the shcematics: ".\BOJ01-kontroler-esp12e-01>"
3. Type in: "kifield.exe -x .\BOJ01-kontroler-esp12e-01.kicad_sch -i '.\fileExtract.csv' -r"
4. Get error: "AttributeError: 'Sheet_V6' object has no attribute 'filename'"

Expected behavior
I'm expecting to get a file "fileExtract.csv" generated in my project folder "\BOJ01-kontroler-esp12e-01>"

Screenshots

PS C:\Users\Matej\Documents\test\BOJ01-kontroler-esp12e-01> kifield.exe -x .\BOJ01-kontroler-esp12e-01.kicad_sch -i '.\fileExtract.csv' -r Traceback (most recent call last): File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Scripts\kifield-script.py", line 33, in <module> sys.exit(load_entry_point('kifield==1.0.0', 'console_scripts', 'kifield')()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Lib\site-packages\kifield\__main__.py", line 149, in main kifield( File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Lib\site-packages\kifield\kifield.py", line 1547, in kifield part_fields_dict = extract_part_fields( ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Lib\site-packages\kifield\kifield.py", line 727, in extract_part_fields f_part_fields_dict = extraction_function( ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Lib\site-packages\kifield\kifield.py", line 435, in extract_part_fields_from_sch_V6 sch = Schematic_V6(filename) # Read in the schematic. ^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\Matej\AppData\Local\Programs\Python\Python311\Lib\site-packages\kifield\sch.py", line 563, in __init__ self.children.append(self.__class__(sheet.filename, sheet.uuid_path)) ^^^^^^^^^^^^^^ AttributeError: 'Sheet_V6' object has no attribute 'filename'

Desktop (please complete the following information):

• OS: Microsoft Windows 10 Professional (x64) Build 19044.2965 (21H2)
• Python version: 3.11.1 (tags/v3.11.1:a7a450f, Dec 6 2022, 19:58:39) [MSC v.1934 64 bit (AMD64)]
• KiField version: 1.0.0
• KiCad version: 7.0.5

Additional context
The schematic has hierarchical sheets