Avoid bogus access to json.choices.delta.content

[ccreutzi]

The streaming interface sometimes responds with something like json.choices = {"index":0,"delta":{},"logprobs":[],"finish_reason":"length"}. Stop blindly assuming json.choices.delta.content exists.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.10%. Comparing base (e72cc99) to head (53c1df5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   97.10%   97.10%           
=======================================
  Files          40       40           
  Lines        1347     1349    +2     
=======================================
+ Hits         1308     1310    +2     
  Misses         39       39           

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