Fix: Improve Python code quality and PEP 8 compliance

[shbhmexe]

Proposed Changes

This PR addresses several code quality issues in the Python codebase to improve PEP 8 compliance and robustness.

Specific changes:

• Improper None Comparisons: Replaced == None and != None with is None and is not None in:
  • SU2_PY/SU2_CFD.py
  • SU2_PY/parallel_computation.py
  • SU2_PY/parallel_computation_fsi.py
  • SU2_PY/topology_optimization.py
  • SU2_PY/SU2/io/data.py
• Bare Except Clauses: Updated SU2_PY/topology_optimization.py to avoid bare except: clauses:
  • Used except OSError: for os.remove calls (handling file not found, permission errors).
  • Used except Exception: for solver execution and parsing blocks (preserving original catch-all behavior for runtime errors but allowing system interrupts like Ctrl+C to propagate).

Related Work

• Fixes code quality issues identified during repository audit.
• Aligns with PEP 8 style guidelines.

PR Checklist

Put an X by all that apply. You can fill this out after submitting the PR. If you have any questions, don't hesitate to ask! We want to help. These are a guide for you to know what the reviewers will be looking for in your contribution.

• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I am submitting my contribution to the develop branch.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

[shbhmexe]

/label code-quality