Create lock even when stage is disconnected

from openflexure_stage import OpenFlexureStage

from serial import SerialException

from openflexure_microscope.lock import StrictLock

import logging

# TODO: Implement lock on movement

class Stage(OpenFlexureStage):

    def __init__(self, *args, **kwargs):

        """

        self.lock = StrictLock(timeout=2)  #: :py:class:`openflexure_microscope.lock.StrictLock`: Strict lock controlling thread access to camera hardware

        try:

            OpenFlexureStage.__init__(self, *args, **kwargs)

        except SerialException as e:

            logging.error("No stage found. Aborting stage.")

            logging.warning("Stage lock can be acquired, but any stage methods will fail and raise exceptions.")

    def _move_rel_nobacklash(self, *args, **kwargs):

        """