Empty string config fields cause confusing errors

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Description

If a user types into a config field, then deletes what was written, then clicks save, sometimes the field is saved as an empty string "". This can cause confusing behavior because this will then be passed as a keyword argument to the underlying LangChain provider.

Next steps are to

1. Set up test case coverage, preferably E2E if possible
2. Implement changes in the frontend and backend to address this