Refactor __exit__ method in name_scope context manager to handle thread-local global state

[Abhinavexists]

Fix #21831

simple fix which just checks if name_scope_stack is empty or dosen't exist
i will build the test case once the approach is approved

[gemini-code-assist]

Summary of Changes

Hello @Abhinavexists, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the stability of the name_scope context manager by improving its exit logic. It addresses potential issues related to the state of the name_scope_stack during thread-local operations, ensuring that the context manager can safely exit without encountering errors even in unexpected or uninitialized scenarios.

Highlights

• exit method refactoring: The __exit__ method of the name_scope context manager has been refactored to robustly handle cases where the name_scope_stack might be empty or non-existent, preventing potential runtime errors.
• Error Handling: Introduced checks for an empty name_scope_stack and wrapped the pop() operation in a try-except block to gracefully handle AttributeError or IndexError.
• **_pop_on_exitusage**: The_pop_on_exitattribute is now called as a method,_pop_on_exit()`, suggesting a change in its intended usage or implementation.

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[gemini-code-assist]

Code Review

The pull request aims to fix an issue in the __exit__ method of the name_scope context manager by adding checks for the existence and emptiness of name_scope_stack. However, the current implementation introduces a critical bug by attempting to call a boolean attribute as a function. My review provides a correction for this bug and simplifies the logic to be more robust and readable, which also aligns with the Keras API design guideline of minimizing cognitive load.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.66%. Comparing base (19ca9c1) to head (85f02ea).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21833   +/-   ##
=======================================
  Coverage   82.66%   82.66%           
=======================================
  Files         577      577           
  Lines       59477    59478    +1     
  Branches     9329     9330    +1     
=======================================
+ Hits        49167    49168    +1     
  Misses       7907     7907           
  Partials     2403     2403           

Flag	Coverage Δ
keras	82.48% <100.00%> (+<0.01%)	⬆️
keras-jax	63.31% <100.00%> (+<0.01%)	⬆️
keras-numpy	57.55% <100.00%> (+<0.01%)	⬆️
keras-openvino	34.34% <100.00%> (+<0.01%)	⬆️
keras-tensorflow	64.12% <100.00%> (+<0.01%)	⬆️
keras-torch	63.60% <100.00%> (+<0.01%)	⬆️

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[Abhinavexists]

I have now added the test cases and have minimised the approach towards handling global_state
cc @fchollet