Why rerank model is deprecated in knowledge base

[AkisAya]

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[AkisAya]

i figure out that this is a bug.
i think the deprecated hint heres tends to say the the workspace has a default rereak model, but after doing some front-end logic we find current rerank model is empty or undefined, so this current model is deprecated.

but here defaultModel is actually a model struct with all fileds empty string like this

{
 "provider":"",
 "model": ""
}

in this situation, the default model is actaully emtpy and not valid.
so here instead of showing the deprecated sign, it's more likely that we tell users to configure at least a rerank model for the workspace like we do for the text-embedding model when it's not set

[AkisAya]

i submit a issue here
#10552