fix(misconf): reject nil plays during playbook parsing

[nikpivkin]

Description

Prevent panic when accessing nil plays by filtering them out during parsing.

This PR is opened from a correct fork and replaces #10132

Related issues

• Close bug(ansible): invalid playbook YAML causes panic #10131

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
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