'Check if the handler is able to be used in the current run of nogotofail.
This should ensure that any required files exist and similar preconditions
to the handler being used.
Returns tuple (precondition_success, error_message)
precondition_success: if all preconditions are met
error_message: message to be logged explaining the failure if precondition_success is False.'

@staticmethod
def check_precondition():

    return (True, '')
