fix: replace bare except with except Exception (#22473)

Replace bare except clauses with except Exception to follow Python best practices and avoid catching unexpected system exceptions like KeyboardInterrupt and SystemExit.

backend/open_webui/retrieval/loaders/external_document.py

@@ -41,7 +41,7 @@ class ExternalDocumentLoader(BaseLoader):
 
         try:
             headers["X-Filename"] = quote(os.path.basename(self.file_path))
-        except:
+        except Exception:
             pass
 
         if self.user is not None:

backend/open_webui/retrieval/loaders/mineru.py

@@ -122,7 +122,7 @@ class MinerULoader:
                 try:
                     error_data = e.response.json()
                     error_detail += f" - {error_data}"
-                except:
+                except Exception:
                     error_detail += f" - {e.response.text}"
             raise HTTPException(status.HTTP_400_BAD_REQUEST, detail=error_detail)
         except Exception as e:
@@ -252,7 +252,7 @@ class MinerULoader:
                 try:
                     error_data = e.response.json()
                     error_detail += f" - {error_data.get('msg', error_data)}"
-                except:
+                except Exception:
                     error_detail += f" - {e.response.text}"
             raise HTTPException(status.HTTP_400_BAD_REQUEST, detail=error_detail)
         except Exception as e:
@@ -355,7 +355,7 @@ class MinerULoader:
                     try:
                         error_data = e.response.json()
                         error_detail += f" - {error_data.get('msg', error_data)}"
-                    except:
+                    except Exception:
                         error_detail += f" - {e.response.text}"
                 raise HTTPException(status.HTTP_400_BAD_REQUEST, detail=error_detail)
             except Exception as e:

backend/open_webui/retrieval/vector/dbs/chroma.py

@@ -123,7 +123,7 @@ class ChromaClient(VectorDBBase):
                     }
                 )
             return None
-        except:
+        except Exception:
             return None
 
     def get(self, collection_name: str) -> Optional[GetResult]: