{"jsonrpc":"2.0","method":"action.update","params":{"actionid":"4","conditions":[

{"conditiontype":15,"operator":0,"value":"1"}

,

{"conditiontype":15,"operator":0,"value":"3"}

]},"auth":"98e183c2503c4dc192285c604bac443d","id":1}

{"jsonrpc":"2.0","error":

{"code":-32500,"message":"Application error.","data":"Cannot perform update statement on table \"actions\" without values."}

,"id":1}

apparently this was only caught by the sanity check before messing up the db... updating conditions separate from action properties should work just fine