Handle None in tool/function arguments. #1170
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The normal OpenAI API returns an empty string when there are no function arguments. The GitHub Copilot wrapper around the OpenAI API seems to return None instead of an empty string when there are no arguments.
Treat None as an empty string. If we still have an empty string at the point that we parse the JSON for the arguments, then use "{}" instead so that we get the expected empty map.
This patch is for supporting the full function of this PR: jmdaly/llm-github-copilot#18 But either can be merged in any order, the two together enable tool calling of anthropic models via github copilot plugin (openai tool calling via github copilot's API works without this patch).