Resolved log(0) error in KL divergence #12233

[anscian]

Describe your change:

Fixes #12233
Resolved log(0) error in kullback_leibler_divergence function implemented in machine_learning/loss_functions.py by filtering zero probabilities from both y_pred and y_true to be completely safe

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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