Handle missing root communities in dynamic selection#2413
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Summary
Fixes #2382 by allowing
DynamicCommunitySelectionto initialize when the community hierarchy has no level0entries. In that case there are no root communities to seed the dynamic traversal, so the selector now starts with an empty queue instead of raisingKeyErrorduring construction.Tests
git diff --checkPYTHONPYCACHEPREFIX=/private/tmp/graphrag-pycache /usr/bin/python3 -m py_compile packages/graphrag/graphrag/query/context_builder/dynamic_community_selection.py tests/unit/query/context_builder/dynamic_community_selection.pyUV_CACHE_DIR=/private/tmp/uv-cache-graphrag uv run ruff check packages/graphrag/graphrag/query/context_builder/dynamic_community_selection.py tests/unit/query/context_builder/dynamic_community_selection.pyUV_CACHE_DIR=/private/tmp/uv-cache-graphrag uv run ruff format --check packages/graphrag/graphrag/query/context_builder/dynamic_community_selection.py tests/unit/query/context_builder/dynamic_community_selection.pyUV_CACHE_DIR=/private/tmp/uv-cache-graphrag PYTHONPATH=packages/graphrag uv run --package graphrag pytest -q tests/unit/query/context_builder/dynamic_community_selection.py