Refactor get_current_utilization b/c it didn't handle case where job.trace_quanta not set

def get_current_utilization(trace, job: Job):

    # Return utilizaiton for a trace at the jobs current running time.

    # Note: this should move to a trace.py and a Trace class!

    util = 0.0

    """Return utilization for a trace at the job's current running time.

       Note: this should move to a trace.py and a Trace class!

    """

    if not job.trace_quanta:

        raise ValueError("job.trace_quanta is not set; cannot compute utilization.")

    if job.trace_quanta:

    time_quanta_index = int((job.running_time - job.trace_start_time) // job.trace_quanta)

    if time_quanta_index < 0:

        time_quanta_index = 0

    if (isinstance(trace, list) and trace != []) or \

    if (isinstance(trace, list) and trace) or \

       (isinstance(trace, np.ndarray) and trace.size != 0):

        if time_quanta_index < len(trace):

            util = get_utilization(trace, time_quanta_index)

        else:

            util = get_utilization(trace, max(0, len(trace) - 1))

    elif isinstance(trace, float) or isinstance(trace, int):

    elif isinstance(trace, (float, int)):

        util = trace

    else:

        util = 0.0