Handles case where input was series with time index

[skrawcz]

So we need to fix the inputs and introspecting them. This is a quick fix to not fail when someone applies the SDK to the quick start example.

Changes

• SDK
• tests for SDK

How I tested this

• locally
• Unit tests

Notes

• this was flagged by a user who was trying out the quick start and then plug in the SDK.

Checklist

• [ ] PR has an informative and human-readable title (this will be pulled into the release notes)
• [ ] Changes are limited to a single goal (no scope creep)
• [ ] Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• [ ] Any change in functionality is tested
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged / future TODOs are captured in comments
• [ ] Project documentation has been updated if adding/changing functionality.