--rank option with arg 'p.value' raises a Value Error about idr HOT 1 CLOSED

def load_samples(args):
    # decide what aggregation function to use for peaks that need to be merged
    idr.log("Loading the peak files", 'VERBOSE')
    if args.input_file_type in ['narrowPeak', 'broadPeak']:
        if args.rank == None: signal_type = 'signal.value'
        else: signal_type = args.rank

        try: 
            signal_index = {"score": 4, "signal.value": 6, 
                            "p.value": 7, "q.value": 8}[signal_type]
        except KeyError:
            raise ValueError(
                "Unrecognized signal type for {} filetype: '{}'".format(
                    args.input_file_type, signal_type))

        if args.peak_merge_method != None:
            peak_merge_fn = {
                "sum": sum, "avg": mean, "min": min, "max": max}[
                    args.peak_merge_method]
        elif signal_index in (4,6):
            peak_merge_fn = sum
        else:
            peak_merge_fn = min
        if args.input_file_type == 'narrowPeak':
            summit_index = 9    ### <--- this was causing it for me, since I throw away 
                                ### everything past column 8