TypeError in serial.tools.list_ports.comports()

[Qlexio]

I had this issue when using our app, which is relying on pyserial. It has two threads, one reading from a serial device and a second one is frequently calling serial.tools.list_ports.comports().

During operation, it failed with this:

Traceback (most recent call last):
  File "/path/utility/SerialDevice.py", line 45, in discover_serial_devices
    ports = serial.tools.list_ports.comports()
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/venv/lib/python3.11/site-packages/serial/tools/list_ports_linux.py", line 102, in comports
    for info in [SysFS(d) for d in devices]
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/venv/lib/python3.11/site-packages/serial/tools/list_ports_linux.py", line 102, in <listcomp>
    for info in [SysFS(d) for d in devices]
                 ^^^^^^^^
  File "/path/venv/lib/python3.11/site-packages/serial/tools/list_ports_linux.py", line 52, in __init__
    self.vid = int(self.read_line(self.usb_device_path, 'idVendor'), 16)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: int() can't convert non-string with explicit base

While we can swallow the exception at the calling site, I don't think serial.tools.list_ports.comports() should throw in the first place.

The hardware is a STM32 board with custom software, and I'm quite sure it misbehaved but again comports() shouldn't throw IMO. I'll try to reproduce the issue, but don't hold your breath.

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This issue has been cloned from: pyserial#774