Spaces in agent names

[rickyloynd-microsoft]

Group chat throws an error if an agent name contains a space.

Should we fix this? If not, would ConversableAgent by the best place to document it?

[afourney]

@rickyloynd-microsoft I am not able to replicate this after #669. Can you check if this resolves the issue?

[rickyloynd-microsoft]

@afourney I never had a repro for the original problem. But after this is merged, I'll ask the user on discord to try it.

[sonichi]

I think this issue refers to a limitation of openai's requirement in the "name" field in messages.