[Bug] [GraphRAG] SchemaNotReadyException: (code=1, message=Collection 'test1_CHUNK_HISTORY' not exist, or you can pass in schema to create one

[xuxl2024]

Search before asking

• I had searched in the issues and found no similar issues.

Operating system information

Windows

Python version information

=3.11

DB-GPT version

main

Related scenes

• Chat Data
• Chat Excel
• Chat DB
• Chat Knowledge
• Model Management
• Dashboard
• Plugins

Installation Information

• Installation From Source

• Docker Installation

• Docker Compose Installation

• Cluster Installation

• AutoDL Image

• Other

Device information

GPU
GPU Count:1
gpu memory:24G

Models information

LLM_MODEL: qwen2.5-7b-instruct
EMBEDDING_MODEL:m3e-base

What happened

在构建知识图谱类型的知识库时，上传文件后，进行文件同步时报错
document embedding failed<SchemaNotReadyException: (code=1, message=Collection 'test1_CHUNK_HISTORY' not exist, or you can pass in schema to create one.)>

What you expected to happen

报错信息来自于milvus_store.py文件中的similar_search_with_scores方法（我使用的向量数据库时milvus），它是由graph_extrator.py的aload_chunk_context方法会调用的，我认为这里的代码逻辑是有缺陷的，在milvus中的collection还没创建的时候，就先调用了similar_search_with_scores方法，而该方法的实现逻辑里并没有判断collection是否存在，所以导致报错提示collection不存在。
修复建议，在similar_search_with_scores方法中增加判断collection是否存在的代码。
原代码如下：

try:
    from pymilvus import Collection, DataType
except ImportError:
    raise ValueError(
        "Could not import pymilvus python package. "
        "Please install it with `pip install pymilvus`."
    )

self.col = Collection(self.collection_name)

修复后的代码如下：

try:
    from pymilvus import Collection, DataType, utility
except ImportError:
    raise ValueError(
        "Could not import pymilvus python package. "
        "Please install it with `pip install pymilvus`."
    )

if not utility.has_collection(self.collection_name):
    return []
self.col = Collection(self.collection_name)

How to reproduce

1.构建一个知识图谱类型的知识库；
2.上传一个文件；
3.选择上传的文件，点击"同步"

Additional context

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[Aries-ckt]

which dbgpt version?

[xuxl2024]

which dbgpt version?

the latest version