_download_chunking.py: avoid to overwrite if_match

[marco-rossi29]

Solve issue #625

[marco-rossi29]

@zezha-msft let me know if this is acceptable

[zezha-msft]

Hi @marco-rossi29, sorry for the delayed reply! And thanks for contributing!

The current design has one problem: because of this line, self.if_match is never None.

In addition, when self.if_match is indeed None (which never happens right now) and we are downloading the blob in parallel chunks, then there's a data race to set its value. I propose to simply remove this line and the comments above it , as it's redundant and not needed.

Please let me know if you'd like to do that. Otherwise I can do it too. Thank you!

[marco-rossi29]

No problem, thank you for responding! Yes, that's perfect for me. I removed it.

I see that you changed the base from master to dev and now there are some spurious changes. Do you want me to remove such changes from my PR by rebasing my two commits on top of 54e60c8?

[zezha-msft]

@marco-rossi29 no it's ok, we had to pull back the changes from master into dev anyways. Thanks!