Crash when using create_task_routine with times before daily_start and daily_end

[heuristicus]

With the setup

    start = time(6,00, tzinfo=localtz)
    end = time(17,45, tzinfo=localtz)

in routine_node.py, attempting to run rosrun tsc_routine routine_node.py will result in various crashes if the time specified in create_task_routine is outside the bounds of the start and end times.

The following

routine.create_task_routine(sweep_tasks_morning, daily_start = time(5,20, tzinfo=localtz), daily_end = time(12,00, tzinfo=localtz), repeat_delta = timedelta(minutes=45))

results in this error:

Traceback (most recent call last):
  File "/home/strands/michal_ws/src/g4s_deployment/tsc_routine/scripts/routine_node.py", line 87, in <module>
    routine.create_task_routine(sweep_tasks_morning, daily_start = time(5,20, tzinfo=localtz), daily_end = time(12,00, tzinfo=localtz), repeat_delta = timedelta(minutes=45))
  File "/home/strands/michal_ws/src/strands_executive_behaviours/routine_behaviours/src/routine_behaviours/robot_routine.py", line 571, in create_task_routine
    self.routine.repeat_every_delta(tasks, delta=repeat_delta, times=1, start_time=daily_start, duration=delta_between(daily_start, daily_end))
  File "/home/strands/michal_ws/src/strands_executive/task_executor/src/task_executor/task_routine.py", line 134, in repeat_every_delta
    self.repeat_every(tasks, window_start.timetz(), delta, times)
  File "/home/strands/michal_ws/src/strands_executive/task_executor/src/task_executor/task_routine.py", line 169, in repeat_every
    rospy.logwarn('Provided daily start %s is less than overall daily start %s. Clamping to daily start.' % (daily_start, self.daily_start))
  File "/usr/lib/python2.7/dist-packages/dateutil/tz.py", line 92, in utcoffset
    if self._isdst(dt):
  File "/usr/lib/python2.7/dist-packages/dateutil/tz.py", line 134, in _isdst
    + dt.second)
AttributeError: 'NoneType' object has no attribute 'toordinal'

The following

routine.create_task_routine(sweep_tasks_afternoon, daily_start = time(12,00, tzinfo=localtz), daily_end = time(18,30, tzinfo=localtz), repeat_delta = timedelta(minutes=45))

results in this error:

Traceback (most recent call last):
  File "/home/strands/michal_ws/src/g4s_deployment/tsc_routine/scripts/routine_node.py", line 88, in <module>
    routine.create_task_routine(sweep_tasks_afternoon, daily_start = time(12,00, tzinfo=localtz), daily_end = time(18,30, tzinfo=localtz), repeat_delta = timedelta(minutes=45))
  File "/home/strands/michal_ws/src/strands_executive_behaviours/routine_behaviours/src/routine_behaviours/robot_routine.py", line 571, in create_task_routine
    self.routine.repeat_every_delta(tasks, delta=repeat_delta, times=1, start_time=daily_start, duration=delta_between(daily_start, daily_end))
  File "/home/strands/michal_ws/src/strands_executive/task_executor/src/task_executor/task_routine.py", line 134, in repeat_every_delta
    self.repeat_every(tasks, window_start.timetz(), delta, times)
  File "/home/strands/michal_ws/src/strands_executive/task_executor/src/task_executor/task_routine.py", line 179, in repeat_every
    daily_duration = self.daily_end - daily_start
AttributeError: 'DailyRoutine' object has no attribute 'daily_end'