Fix AttributeError when post_sort_method is NULL

[Jrjy3]

Issue

Application crashes with AttributeError: 'NoneType' object has no attribute 'value' when downloading from users/subreddits that have NULL post_sort_method in the database.

Root Cause

Database records with NULL post_sort_method (from legacy data or incomplete migrations) cause a crash at download_runner.py:372 when the code attempts to access .value on None.

Stack Trace

File "download_runner.py", line 372, in get_raw_submissions
AttributeError: 'NoneType' object has no attribute 'value'

Full Stack Trace

{
    "levelname": "CRITICAL",
    "asctime": "11/07/2025 08:14:41 PM",
    "filename": "main.py",
    "module": "main",
    "name": "DownloaderForReddit.__main__",
    "funcName": "log_unhandled_exception",
    "lineno": 48,
    "message": "Unhandled exception",
    "exc_info": "Traceback (most recent call last):\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 195, in run\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 243, in run_download\n  File \"DownloaderForReddit\\core\\runner.py\", line 12, in check\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 282, in get_reddit_object_submissions\n  File \"DownloaderForReddit\\core\\runner.py\", line 12, in check\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 296, in get_user_submissions\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 311, in handle_submissions\n  File \"DownloaderForReddit\\core\\runner.py\", line 12, in check\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 336, in get_submissions\n  File \"DownloaderForReddit\\core\\download_runner.py\", line 372, in get_raw_submissions\nAttributeError: 'NoneType' object has no attribute 'value'"
}

Solution

Add null check with fallback to PostSortMethod.NEW (the schema default) before accessing sort_method.value. The record is updated in-place to prevent future errors.

Migration

No database migration required. NULL values are handled at runtime and auto-corrected on first access.

Testing

Tested with database containing 163 NULL records. All downloads complete successfully with auto-correction.