Assert user_id for RAG.setup()

[isaac-chung]

Missed check. Current behaviour:

In [15]: RAG.setup()
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ in <module>:1                                                                                    │
│                                                                                                  │
│ /Users/isaacchung/work/clarifai-python/clarifai/rag/rag.py:65 in setup                           │
│                                                                                                  │
│    62 │   │   >>> rag_agent = RAG.setup()                                                        │
│    63 │   """                                                                                    │
│    64 │   if not user_id:                                                                        │
│ ❱  65 │     raise UserError(                                                                     │
│    66 │   │     "user_id must be provided. It can be found at https://clarifai.com/settings.")   │
│    67 │   user = User(user_id=user_id, base_url=base_url, pat=pat)                               │
│    68 │   llm = Model(llm_url)                                                                   │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
UserError: user_id must be provided. It can be found at https://clarifai.com/settings.

Users must supply their user_id.

[sanjaychelliah]

👍