LangChain-Community - AzureCosmos Mongo vCore: Bug Fix when the data doesn't contain metadata field

[aayush3011]

Thank you for contributing to LangChain!

• Description: Adding an empty metadata field when metadata is not present in the data
• Issue: This PR fixes the issue when the data items doesn't contain the metadata field. This happens when there is already data in the container, or cx uses CosmosDB Python SDK to insert data.
• Dependencies: No dependencies required

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Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Oct 31, 2024 2:42am

[aayush3011]

@baskaryan can I get a quick review on this PR. I found this bug while working on a demo I am giving at a conference.