1. Your first marriage is not null and void since the ex-parte decree got set aside by your ex-wife (who will be legally treated as your wife till you go for the decree of divorce as per MCD petition),
2. So, when you had married for the second time, you were already married to your first wife,
3. Condonation of delay did not have an effect of setting aside the decree itself. The delay in filing the appeal challenging your ex-parte deree was condoned after which her appeal was heard and order for seting aside the ex-parte decree was passed,
4. No bigamy charge will finally stand against ou since at the time of marrying your second wife, you had received the ex-parte deree of divorce (which was set aside later on).