don't ignore errors that occur when the TLS ClientHello is generated

[marten-seemann]

Recreating #3420 due to wrong merge method used there. Fixes #3419.

[codecov]

Codecov Report

Merging #3424 (2e98150) into master (2e98150) will not change coverage.
The diff coverage is n/a.

❗ Current head 2e98150 differs from pull request most recent head 53be3ee. Consider uploading reports for the commit 53be3ee to get more accurate results

@@           Coverage Diff           @@
##           master    #3424   +/-   ##
=======================================
  Coverage   85.41%   85.41%           
=======================================
  Files         136      136           
  Lines        9928     9928           
=======================================
  Hits         8480     8480           
  Misses       1066     1066           
  Partials      382      382           

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