Bug fix combinations (#11158)

* Update all_combinations.py

The original implementation had limitations in handling edge cases and certain input parameters, leading to potential RecursionError.

* Update all_combinations.py

Added checks to handle cases where n or k are negative or where k is greater than n. In such scenarios, the function now returns an empty list, avoiding invalid recursive calls.

* Update error handling

Added checks to handle cases where `n` or `k` are negative or where `k` is greater than `n`. In such scenarios, the function now returns an empty list, avoiding invalid recursive calls.

* Update backtracking/all_combinations.py

* Update all_combinations.py

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Co-authored-by: Christian Clauss <[email protected]>