Catch errors when decoding ASCII

[ElectricRCAircraftGuy]

Do a try/catch around this line, and gracefully handle errors when the chars are binary instead of ASCII:

eRCaGuy_PyTerm/serial_terminal.py

Line 151 in 1274e81

data_str = data_bytes.decode('ascii')

Sometimes garbled data comes over serial, crashing the program otherwise when an invalid (ie: binary instead of ASCII) byte arrives.

[ElectricRCAircraftGuy]

Example error:

auto-flusTraceback (most recent call last):
  File "C:\Users\gabriel\GS\dev\eRCaGuy_PyTerm\serial_terminal.py", line 264, in <module>

    main()
  File "C:\Users\gabriel\GS\dev\eRCaGuy_PyTerm\serial_terminal.py", line 151, in main
    data_str = data_bytes.decode('ascii')
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'ascii' codec can't decode byte 0xf9 in position 3: ordinal not in range(128)