GH-4586 Fixed some merge exceptions in `DeepSeekStreamFunctionCallingHelper`#4598

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sunyuhan1998 wants to merge 2 commits intospring-projects:mainfrom

sunyuhan1998:fix-issue-4586

Commits on Oct 10, 2025

fix: GH-4586 fixed a handling exception in `DeepSeekStreamFunctionCallingHelper` when `toolCalls()` returns an empty list instead of null; corrected a flawed ternary expression; and added correspon…
sunyuhan1998
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fix: fix code format
sunyuhan1998
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