fix(ui): be lenient when calling nullable onThreadTap method

[esarbanis]

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Description of the pull request

Be lenient on the presence of onThreadTap paramenter in BottomRow component.

Error:

I/flutter (30434): Error while fetching message: Null check operator used on a null value, #0      BottomRow.build._onThreadTap (package:stream_chat_flutter/src/message_widget/bottom_row.dart:172:27)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (35d338e) 59.18% compared to head (f79c74d) 59.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1854      +/-   ##
==========================================
+ Coverage   59.18%   59.41%   +0.22%     
==========================================
  Files         310      310              
  Lines       17828    17828              
==========================================
+ Hits        10552    10592      +40     
+ Misses       7276     7236      -40     

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