def delete(expnum, ccd, version, ext, prefix=None):
    """
    delete a file, no error on does not exist

    @param expnum:
    @param ccd:
    @param version:
    @param ext:
    @param prefix:
    @return:
    """
    uri = get_uri(expnum, ccd=ccd, version=version, ext=ext, prefix=prefix)
    remove(uri)