Distinguish 404 Not Found and empty container in internal_proxy

Registered by Keiichi Hikita

TODO comment says "we should distinguish between 404 and empty container"

There was TODO comment in internal_proxy like the above.
But we can not pass PEP8 check if code has TODO comment.

So I move this TODO from code and manage here.

==========
This is moved from TODO comment in internal_proxy.py line 188.

Blueprint information

Status:
Complete
Approver:
Keiichi Hikita
Priority:
Low
Drafter:
Keiichi Hikita
Direction:
Approved
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Keiichi Hikita

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