Fix: 'NoneType' object has no attribute 'session_process'

[klieret]

Fixes #771

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 73.32%. Comparing base (d913dd8) to head (3aadf98).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sweagent/environment/swe_env.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #776      +/-   ##
==========================================
- Coverage   73.40%   73.32%   -0.08%     
==========================================
  Files          31       31              
  Lines        4564     4566       +2     
==========================================
- Hits         3350     3348       -2     
- Misses       1214     1218       +4     

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