hotfix: fix dump_dataset in dump_processed.py

[felixzinn]

Hi

i think the dump_dataset function did not compare the processed dataset filenames of the coffea output correctly with the dataset json file.
Please verify that the changes work correctly. For me they work now. Previously all files from the json file were listed as failed although they were contained in the coffea output file.

previously the code looked like this

original_list, list_from_coffea = {}, {}
    for j in jsonlist:
        old = json.load(open(j))
        for o in old.keys():
            if o not in original_list.keys():
                original_list[o] = []
            original_list[o].extend(old[o])

for m in output.keys():
        for f in output[m].keys():
            if f not in list_from_coffea.keys():
                list_from_coffea[f] = []
            else:
                list_from_coffea[f] += list(set(output[m][f]["fname"]))

since list_from_coffea is instantiated as an empty dictionary, there will be no keys and hence list_from_coffea will be filled with empty lists instead of the list from the coffea output

[Ming-Yan]

Hi @felixzinn thank you for fixing this, this PR looks good to me, merge it