Trivals. (#8597)

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/utils/log_utils.py

 def log_exception(e, *args):
     logging.exception(e)
     for a in args:
-        logging.error(str(a))
+        if hasattr(a, "text"):
+            logging.error(a.text)
+            raise Exception(a.text)
+        else:
+            logging.error(str(a))
     raise e

graphrag/general/index.py

 
     subgraph = await generate_subgraph(
         LightKGExt
-        if "method" not in row["kb_parser_config"]["graphrag"] or row["kb_parser_config"]["graphrag"]["method"] != "general"
+        if "method" not in row["kb_parser_config"].get("graphrag", {}) or row["kb_parser_config"]["graphrag"]["method"] != "general"
         else GeneralKGExt,
         tenant_id,
         kb_id,

rag/svr/task_executor.py

                         d["image"].close()  # Close original image
                         d["image"] = converted_image
                     d["image"].save(output_buffer, format='JPEG')
-                    d["image"].close()  # Close PIL image after saving
                 
                 async with minio_limiter:
                     await trio.to_thread.run_sync(lambda: STORAGE_IMPL.put(task["kb_id"], d["id"], output_buffer.getvalue()))
                 d["img_id"] = "{}-{}".format(task["kb_id"], d["id"])
+                if not isinstance(d["image"], bytes):
+                    d["image"].close()
                 del d["image"]  # Remove image reference
                 docs.append(d)
             finally: