[Bugfix] Fix fallback loading for IndexTTS external models (#6137)

Signed-off-by: boatman <109857087+sphinxkkkbc@users.noreply.github.com>

vllm_omni/model_executor/models/indextts2/preprocess_utils.py

@@ -102,9 +102,6 @@ def load_wav2vec2(model_path: str, device: torch.device):
         except Exception as exc:
             raise RuntimeError(f"Failed to load local IndexTTS Wav2Vec2-BERT assets from {local_dir!r}") from exc
 
-    if local_dir is None and os.path.isdir(model_path):
-        raise FileNotFoundError(f"IndexTTS Wav2Vec2-BERT assets are missing from local bundle {model_path!r}")
-
     # Try a remote model subfolder, then the public base model.
     try:
         if model is None or processor is None:
@@ -173,8 +170,6 @@ def load_semantic_codec(
         state = torch.load(ckpt_path, map_location="cpu", weights_only=True)
         codec.load_state_dict(state, strict=False)
     else:
-        if os.path.isdir(model_path):
-            raise FileNotFoundError(f"IndexTTS RepCodec checkpoint is missing from local bundle {model_path!r}")
         import safetensors.torch
         from huggingface_hub import hf_hub_download
 
@@ -203,8 +198,6 @@ def load_campplus(model_path: str, device: torch.device):
         if ckpt_path is not None:
             break
     if ckpt_path is None:
-        if os.path.isdir(model_path):
-            raise FileNotFoundError(f"IndexTTS CAMPPlus checkpoint is missing from local bundle {model_path!r}")
         from huggingface_hub import hf_hub_download
 
         ckpt_path = hf_hub_download("funasr/campplus", filename="campplus_cn_common.bin")