fix(useToolCalls): handle null toolcall args cause toolcall error

[hexqi]

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PR

解决部分场景LLM接口工具调用参数返回null导致工具调用失败问题

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Built its own designer, fully self-validated

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Background and solution

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Bug Fixes
  • Improved argument parsing robustness to prevent potential runtime issues.

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[coderabbitai]

Walkthrough

The change adds a nullish coalescing operator to the parsedArgs assignment in useToolCalls.ts, ensuring that when parseArgs() returns null or undefined, an empty object is used instead, improving type safety and preventing downstream issues.

Changes

Cohort / File(s)	Summary
Tool call parsing safety packages/plugins/robot/src/composables/features/useToolCalls.ts	Added nullish coalescing operator (??) to provide default empty object when parseArgs() returns null or undefined, preventing potential type errors in downstream code

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A little ?? guard so neat,
Makes parsing errors defeat,
When null and void come calling near,
An empty object calms the fear! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly addresses the main change: handling null toolcall args to prevent toolcall errors, which matches the fix of adding a nullish coalescing default to parsedArgs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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