[talideon]

Even where there's no constitutional requirement to have a quorum for votes, it's still possible to have a rule of order requiring a quorum before a vote can take place.

Ireland is an example of this: for there to be a quorum in either house, at least twenty members have to be present. This means at least 1/3 of the Seanad (upper house, 60 seats) or 12% of the Dáil (lower house, 166 seats) must be present for either to form a quorum. That's not written in the constitution, but a standing order of the Oireachtas (parliament).

Even if France has no such requirement in its constitution, it's ridiculous that there isn't at least a parliamentary rule of order requiring it.