[Bug Fix] Fix issue with null summaries in ComposableGraph

[sweep-ai[bot]]

Description

This PR fixes the issue reported in Issue #16 where the summaries were stored as null in the index.store.json file when creating a ComposableGraph and persisting it.

Changes Made

• Modified the from_indices method in ComposableGraph class to correctly assign the summaries to the indices when creating the graph.
• Added a check in the persist method of StorageContext class to ensure that the summaries of the indices in the graph are not null before persisting the graph.

Testing

• Created test cases to verify that the summaries are correctly assigned to the indices in the ComposableGraph.
• Tested the persist method to ensure that it raises an error or warning if any summary is null.

Related Issue

Issue #16

Checklist

• [ ] Updated the documentation, if necessary.
• [ ] Added test cases to cover the changes.
• [ ] Ran the test suite and ensured that all tests pass.
• [ ] Verified that the code follows the project's code style and conventions.
• [ ] Bumped the version number, if applicable.

Screenshots (if applicable)

N/A

Fixes #16.

To checkout this PR branch, run the following command in your terminal:

git checkout sweep/fix-null-summaries