def make_breadcrumbs(*args):
    """Build a breadcrumbs list from alternating label/url pairs or (label, url) tuples.

    Usage:
      make_breadcrumbs(('Ausschreibungen', '/ausschreibungen/'), ('Mein Tender', None))
    """
    crumbs = []
    for item in args:
        if isinstance(item, (list, tuple)) and len(item) == 2:
            label, url = item
        else:
            label, url = item, None
        crumbs.append({'label': label, 'url': url})
    return crumbs