Bug: Vertex AI passthrough fails with project name=None and location=None

Bug: Vertex AI passthrough fails with project name=None and location=None: a task in LegoFlow-SWE (Harbor dataset). When using LiteLLM’s Vertex AI passthrough with use in pass through: true , requests fail because the proxy does not read the configured vertex project and vertex location . The…

The task

When using LiteLLM’s Vertex AI passthrough with `use_in_pass_through: true`, requests fail because the proxy does not read the configured `vertex_project` and `vertex_location`. The resulting URL contains `None`:

Part of Lego-X/LegoFlow-SWE.