fix(llm): remove duplicate snippet after rebase (#13444)

https://konghq.atlassian.net/browse/KAG-5067

kong/llm/proxy/handler.lua

@@ -165,22 +165,6 @@ local function handle_streaming_frame(conf)
       return
     end
 
-    if not events then
-      -- usually a not-supported-transformer or empty frames.
-      -- header_filter has already run, so all we can do is log it,
-      -- and then send the client a readable error in a single chunk
-      local response = ERROR__NOT_SET
-
-      if is_gzip then
-        response = kong_utils.deflate_gzip(response)
-      end
-
-      ngx.arg[1] = response
-      ngx.arg[2] = true
-
-      return
-    end
-
     for _, event in ipairs(events) do
       local formatted, _, metadata = ai_driver.from_format(event, conf.model, "stream/" .. conf.route_type)
 
@@ -583,4 +567,4 @@ function _M:access(conf)
 
 end
 
-return _M
+return _M