Fixed IndexError when accessing the container port info

[Nusnus]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 23.69%. Comparing base (00b9b5a) to head (2d45c56).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pytest_celery/api/container.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #417      +/-   ##
==========================================
- Coverage   23.71%   23.69%   -0.02%     
==========================================
  Files          41       41              
  Lines        1286     1287       +1     
  Branches      254      255       +1     
==========================================
  Hits          305      305              
- Misses        953      954       +1     
  Partials       28       28              

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