Check .Message for null #387

[awaescher]

No description provided.

[Copilot]

Pull request overview

Addresses #387 by hardening streaming chat response handling so that response chunks with a null Message are ignored, preventing null dereferences while preserving the final assembled assistant message in chat history.

Changes:

• Update Chat.SendAsAsync(...) to skip streamed chunks where answer is null or answer.Message is null, and to use a non-null answerMessageChunk for Thinking/Content access.
• Add a unit test ensuring streaming ignores response chunks that do not contain a message.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/ChatTests.cs	Adds coverage to ensure streamed chunks with Message = null are ignored and do not break streaming/output.
src/OllamaSharp/Chat.cs	Prevents null dereferences by skipping chunks without a Message and reading Thinking/Content via a non-null pattern match.

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