As per your query There is no express provision in CrPc for abetment of the trial proceedings after the death of the sole accused but not applicable upon the co-accused. It is a well-established doctrine through various Supreme Court and High Court Judgements.
Although there is an express provision for abetment of appeals after the death of the accused is given under section 394 CrPC. It provides that appeals arising out of conviction should abet if the sole accused dies during the pendency of the trial.
Section 394 of Cr.PC has one limitation. Appeals that have arisen from the sentence of fine cannot be abated even if the accused dies before the final disposal of the appeal. Hope it clarifies your issues! Regards Minakshi Bindhani