vision: fix models missing "text_config"

Author: ngxson

convert_hf_to_gguf.py

@@ -1087,6 +1087,8 @@ def __init__(self, *args, **kwargs):
             raise TypeError("VisionModel must be subclassed with model_arch = gguf.MODEL_ARCH.CLIP_VISION")
 
         # get n_embd of the text model
+        if "text_config" not in self.hparams:
+            self.hparams["text_config"] = {}
         text_config = {**self.hparams, **self.hparams["text_config"]}
         self.n_embd_text = text_config.get("hidden_size", text_config.get("n_embd", 0))
         assert self.n_embd_text > 0, "n_embd not found in hparams"