fix flight1parse processing exception

[minlp]

Description

fixing the issue where the "server hello" arrives late, if the flight1Parse method fails to handle it properly, it can lead to a failure in connecting to the media server.

Reference issue

Fixes #...
pion/webrtc#2629 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dc751e3) 77.68% compared to head (213aa9b) 77.80%.

❗ Current head 213aa9b differs from pull request most recent head 0d9dd53. Consider uploading reports for the commit 0d9dd53 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #599      +/-   ##
==========================================
+ Coverage   77.68%   77.80%   +0.11%     
==========================================
  Files         101      101              
  Lines        6435     6437       +2     
==========================================
+ Hits         4999     5008       +9     
+ Misses       1058     1054       -4     
+ Partials      378      375       -3     

Flag	Coverage Δ
go	77.82% <100.00%> (+0.11%)	⬆️
wasm	63.17% <100.00%> (+0.11%)	⬆️

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