save the parquet file even without surviving events for proper normalization
requested to merge 122-save-the-parquet-file-for-proper-normalization-even-without-surviving-events into master
- /higgs_dna/workflows/base.py
- /higgs_dna/workflows/top.py
- /higgs_dna/workflows/HHbbgg.py
- /higgs_dna/workflows/Zmmy.py
Closes #122