fix: restrict rfc bulkload to those with a Document object

[rjsparks]

No description provided.

[jennifer-richards]

lgtm

One thought inline in case it resonates, but if the doc names are corrupted in a way that it matters then we're in deeper trouble already.

[jennifer-richards]

If you wanted to be paranoid, you could iterate over Documents instead of numbers and use doc.name and doc.rev here. I think the data are clean in this regard, though.

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.39%. Comparing base (37888b3) to head (7772091).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
ietf/sync/utils.py	84.21%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10289      +/-   ##
==========================================
- Coverage   88.39%   88.39%   -0.01%     
==========================================
  Files         325      325              
  Lines       43453    43459       +6     
==========================================
+ Hits        38410    38415       +5     
- Misses       5043     5044       +1     

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