[1.3.11rc2] UnicodeDecodeError in virtual printer's readline

[sentry-io]

Sentry Issue: SERVER-SX

UnicodeDecodeError: 'ascii' codec can't decode byte 0x80 in position 0: ordinal not in range(128)
  File "octoprint/util/comm.py", line 2730, in _readline
    ret = self._serial.readline()
  File "home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer/virtual.py", line 1424, in readline
    self._seriallog.info(u">>> {}".format(line.strip()))

Unexpected error while reading from serial port

See also this comment by @trunzoc. Probably caused by something weird in the config.yaml and possibly easily fixed by some more type safety, but waiting for config.yaml excerpt to be sure.

[foosel]

Reproduced. Default configuration for devel.virtualPrinter.resetLines triggers the issue (and due to hunting down a different bug earlier I didn't have that active).

[foosel]

Fixed by the above commit, ready for 1.3.11rc3

[foosel]

Workaround until RC3:

devel:
  virtualPrinter:
    resetLines:
      - start

in config.yaml

[foosel]

1.3.11rc3 is out which should fix this.