BugFix(stream): fix crash when peer send reset stream frame but has no error code

[weimch]

No description provided.

[codecov]

Codecov Report

Merging #82 (be85da2) into main (1f475f3) will increase coverage by 0.01754%.
The diff coverage is 50.00000%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main         #82         +/-   ##
===================================================
+ Coverage   81.71708%   81.73462%   +0.01754%     
===================================================
  Files            855         855                 
  Lines          33720       33725          +5     
===================================================
+ Hits           27555       27565         +10     
+ Misses          6165        6160          -5     

Files	Coverage Δ
trpc/stream/trpc/trpc_client_stream.cc	82.41758% <50.00000%> (-0.26399%)	⬇️
trpc/stream/trpc/trpc_server_stream.cc	94.69697% <50.00000%> (-0.68766%)	⬇️

... and 4 files with indirect coverage changes