udev_pseudo.py

def is_empty(device_path):
    
    device_info = udev_db.get_device_info(device_path)
    
    # This is probably too simplistic ...
    # Check to see if a partition table exists
    if 'ID_PART_TABLE_TYPE' in device_info:
        return False
    
    # Check if a usage is given, domain includes
    # 'filesystem', 'raid', 'other'
    if 'ID_FS_USAGE' in device_info:
        return False
    
    return True
    

First conditional should be:

if 'ID_PART_TABLE_TYPE' in device_info and 'ID_PART_ENTRY_DISK' not in device_info:

The rest looks good.