[Fix] Handle missing geometry keys in latexify for lithium plating mo…

[swastim01]

[Fix] Handle missing geometry keys in latexify for lithium plating models (#4218)

Description

This PR fixes a KeyError: 'min' that occurred when using latexify() on models with lithium plating (e.g., SPM with options={"lithium plating": "irreversible"}).
The issue was caused by missing geometry keys (min/max) during LaTeX equation generation.
This change adds safe handling for those missing keys, allowing correct LaTeX output without errors.

Fixes

Fixes #4218

Type of change

• Bug fix (non-breaking change)

Changes Made

• Added checks for "min" and "max" keys in latexify.py
• Added unit test test_latexify_with_lithium_plating to verify the fix

Changelog

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #):

- Fixes `KeyError: 'min'` in `latexify()` for lithium plating models when certain geometry keys are missing. ([#5245](https://github.com/pybamm-team/PyBaMM/pull/5245))

Testing

• Manual test:

  import pybamm
  model = pybamm.lithium_ion.SPM(options={"lithium plating": "irreversible"})
  model.latexify()
  

• All unit tests passed.
• Code style checks passed.

Checklist

• No style issues
• All tests pass
• Documentation builds
• Code is commented where needed
• Test added to confirm the fix works