'Driver for Source Ranges. Calls helpers as needed.
return: (bool, [list of AuditIssues])'

def inspect_source_ranges(self, item):

    errors = []
    source_ranges = item.config.get('SourceRanges', None)
    if source_ranges:
        err = self._source_ranges_open(source_ranges)
        (errors.extend(err) if err else None)
    if errors:
        return (False, errors)
    return (True, None)
