mirror of https://github.com/hwchase17/langchain
core: fix return of draw_mermaid_png and change to not save image by default (#19950)
- **Description:** Improvement for #19599: fixing missing return of graph.draw_mermaid_png and improve it to make the saving of the rendered image optional Co-authored-by: Angel Igareta <angel.igareta@klarna.com>pull/19954/head
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