feat: Check if any files exists before publishing RFC

[kesara]

Fixes #10757

[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.48%. Comparing base (15b2abd) to head (21bda80).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
ietf/api/views_rpc.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10782      +/-   ##
==========================================
+ Coverage   88.42%   88.48%   +0.06%     
==========================================
  Files         331      332       +1     
  Lines       44557    44838     +281     
==========================================
+ Hits        39399    39676     +277     
- Misses       5158     5162       +4     

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[jennifer-richards]

Nice! Two things (plus a comment inline that is just a comment, not a request for change). See inline for thing one. Thing two: test should cover the "blob-exists" case in addition to the "file-exists" case.