local搜索报错：ZeroDivisionError: Weights sum to zero, can't be normalized

[Ikaros-521]

An error occurred: GraphRAG query failed: Traceback (most recent call last):
File "f:\GraphRAG-Ollama-UI\Miniconda3\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "f:\GraphRAG-Ollama-UI\Miniconda3\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query_main.py", line 76, in
run_local_search(
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\cli.py", line 154, in run_local_search
result = search_engine.search(query=query)
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\structured_search\local_search\search.py", line 118, in search
context_text, context_records = self.context_builder.build_context(
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\structured_search\local_search\mixed_context.py", line 139, in build_context
selected_entities = map_query_to_entities(
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\context_builder\entity_extraction.py", line 55, in map_query_to_entities
search_results = text_embedding_vectorstore.similarity_search_by_text(
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\vector_stores\lancedb.py", line 118, in similarity_search_by_text
query_embedding = text_embedder(text)
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\context_builder\entity_extraction.py", line 57, in
text_embedder=lambda t: text_embedder.embed(t),
File "F:\GraphRAG-Ollama-UI\origin\GraphRAG-Local-UI\graphrag\query\llm\oai\embedding.py", line 96, in embed
chunk_embeddings = np.average(chunk_embeddings, axis=0, weights=chunk_lens)
File "f:\GraphRAG-Ollama-UI\Miniconda3\lib\site-packages\numpy\lib\function_base.py", line 550, in average
raise ZeroDivisionError(
ZeroDivisionError: Weights sum to zero, can't be normalized

[Ikaros-521]

microsoft/graphrag#646