def guess_fill_char(left_comp, right_comp):
    """
    For the case where there is no annotated synteny we will try to guess it
    """
    return '*'
    if (left_comp.src == right_comp.src and left_comp.strand != right_comp.
        strand):
        if left_comp.end == right_comp.start:
            return '-'
    return '*'
