Fix exception causes all over the codebase #1007

[cool-RR]

Why are these changes needed?

This is a continuation of #1007 for the entire codebase.

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[cool-RR]

@microsoft-github-policy-service agree

[cool-RR]

@LinxinS97 this is a continuation of #1007

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (cb6512d) 30.27% compared to head (7598c48) 40.65%.

Files	Patch %	Lines
autogen/agentchat/contrib/math_user_proxy_agent.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1014       +/-   ##
===========================================
+ Coverage   30.27%   40.65%   +10.37%     
===========================================
  Files          30       30               
  Lines        3980     3980               
  Branches      897      946       +49     
===========================================
+ Hits         1205     1618      +413     
+ Misses       2696     2233      -463     
- Partials       79      129       +50     

Flag	Coverage Δ
unittests	40.60% <0.00%> (+10.37%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ekzhu]

A small formatting issue see run result.