fix: Change the mapdl_inprocess graphics backend

[koubaa]

Fixes #3916

mapdl_inprocess should use None for graphics backend. This will have to be revisited with some automated tests when 2025R2 is released.

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

This pull request updates the MapdlCore class constructor to prevent a ModuleNotFoundError when GraphicsBackend.MAPDL is used without the optional graphics dependencies installed. The modification ensures that the exception is only raised if a graphics backend other than MAPDL is specified and the necessary libraries are missing.

Class Diagram: Update to MapdlCore for Graphics Backend Handling

classDiagram
    class MapdlCore {
        +__init__(self, ..., graphics_backend: Optional[GraphicsBackend] = None, **kwargs)
        - _graphics_backend: GraphicsBackend
        # Other methods and attributes...
    }
    class GraphicsBackend {
      <<enumeration>>
      PYVISTA
      MAPDL
      NONE
      # Potentially other enum values
    }
    MapdlCore ..> GraphicsBackend : uses
    note for MapdlCore "__init__ method updated:\nPrevents ModuleNotFoundError if 'graphics_backend' is GraphicsBackend.MAPDL,\neven when optional graphics dependencies are not installed."

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File-Level Changes

Change	Details	Files
Refined graphics backend initialization to avoid unnecessary exceptions.	Modified the conditional statement in the MapdlCore constructor to not raise a ModuleNotFoundError if graphics_backend is GraphicsBackend.MAPDL and the optional graphics libraries are not installed.	src/ansys/mapdl/core/mapdl_core.py

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[sourcery-ai]

Hey @koubaa - I've reviewed your changes - here's some feedback:

• When graphics_backend is GraphicsBackend.MAPDL and PyVista is unavailable, ensure self._graphics_backend is explicitly assigned to GraphicsBackend.MAPDL to fully enable its functionality, not just bypass the error.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.27%. Comparing base (a1a20bc) to head (30a7f6c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3915      +/-   ##
==========================================
- Coverage   88.28%   88.27%   -0.01%     
==========================================
  Files         187      187              
  Lines       14830    14830              
==========================================
- Hits        13092    13091       -1     
- Misses       1738     1739       +1     

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[germa89]

LGTM