Make elm327.py able to talk to ELM327 clones

[BinaryMercenary]

Fix: Wrap the buffer.decode in a try and set bogus string.
This increases compatibility by 5-10x with post elm327 made after 2022.
(I've tested this)

The change is in ./obd/elm327.py
near the last few lines,
# convert bytes into a standard string
string = buffer.decode("utf-8", "ignore")

    # convert bytes into a standard string
    try:
        string = buffer.decode("utf-8", "ignore")
    except:
        string = "Null response. Possibly an elm327 clone - try to connect anyway."