My first post here, I'm usually a silent reader but I was suprised not to see this news make it to this forum yet.
Article is in french:
Un avion de la compagnie Airlinair atterrit d'urgence à Clermont-Ferrand, Société - NouvelObs.com
The text mentions that a lightning stike cause depressurization in the cabin (apparently progressive) that prompted for the emergency landing.
Flight was scheduled from Beziers to Paris. Plane was carrying 23 passengers + 3 staff, all walked away safely. Only 8 people complained of ear discomfort and were taken to hospital for examination.