Annotate with population calls if have data installed.

def annotate_gemini(data, retriever=None):
    """Annotate with population calls if have data installed.
    """
    r = dd.get_variation_resources(data)
    return all([r.get(k) and objectstore.file_exists_or_remote(r[k]) for k in ["exac", "gnomad_exome"]])