fix: resolve 3 bugs

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Added null-safety guard: .map() on an undefined collection threw TypeError; now falls back to [].
• Added null-safety guard: .map() on an undefined collection threw TypeError; now falls back to [].
• Added null-safety guard: .map() on an undefined collection threw TypeError; now falls back to [].

Type of Change

• Bug fix (non-breaking change fixing an issue)

How Has This Been Tested?

• Local manual testing

Checklist

• My code follows the style guidelines
• I have performed a self-review

Related Issue

Ref: #203

[github-actions]

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