fix: normalize empty working_dir to unset when isolation:worktree is set on AgentTool - #7403

fix: normalize empty working_dir to unset when isolation:worktree is set on AgentTool#7403

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QwenLM:mainQwenLM/qwen-code:mainfrom

mvanhorn:fix/7316-agent-empty-working-dir-isolationmvanhorn/qwen-code:fix/7316-agent-empty-working-dir-isolationCopy head branch name to clipboard