fix: replace bare string raises with proper exception types (open-webui#22446)

`raise "string"` in Python raises TypeError instead of the intended
error, making error messages confusing and debugging difficult.

Co-authored-by: gambletan <ethanchang32@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

backend/open_webui/retrieval/utils.py

@@ -590,7 +590,7 @@ def generate_openai_batch_embeddings(
         if "data" in data:
             return [elem["embedding"] for elem in data["data"]]
         else:
-            raise "Something went wrong :/"
+            raise ValueError("Unexpected OpenAI embeddings response: missing 'data' key")
     except Exception as e:
         log.exception(f"Error generating openai batch embeddings: {e}")
         return None
@@ -767,7 +767,7 @@ def generate_ollama_batch_embeddings(
         if "embeddings" in data:
             return data["embeddings"]
         else:
-            raise "Something went wrong :/"
+            raise ValueError("Unexpected Ollama embeddings response: missing 'embeddings' key")
     except Exception as e:
         log.exception(f"Error generating ollama batch embeddings: {e}")
         return None

backend/open_webui/routers/ollama.py

@@ -1747,7 +1747,7 @@ async def download_file_stream(
 
                                 yield f"data: {json.dumps(res)}\n\n"
                             else:
-                                raise "Ollama: Could not create blob, Please try again."
+                                raise RuntimeError("Ollama: Could not create blob, Please try again.")
 
 
 # url = "https://huggingface.co/TheBloke/stablelm-zephyr-3b-GGUF/resolve/main/stablelm-zephyr-3b.Q2_K.gguf"