[BugFix] Fix the issue with stream=True (#2955)

Signed-off-by: amy-why-3459 <wuhaiyan17@huawei.com>

vllm_omni/engine/output_processor.py

@@ -118,10 +118,9 @@ class OmniRequestState(RequestState):
                 if isinstance(v, list) and v and isinstance(v[0], torch.Tensor):
                     try:
                         if k == "audio":
-                            # Concatenate delta audio chunks (1-D) into the full waveform.
-                            # Each entry is a per-step slice; flatten to -1 so chunks with
-                            # inconsistent leading dims can still be joined on the sample axis.
-                            self.mm_accumulated[k] = torch.cat([t.reshape(-1) for t in v], dim=0)
+                            # When the audio tensor shape is inconsistent, torch.cat will fail.
+                            # We need to use torch.cat in -1 dimension.
+                            continue
                         elif k == "sr":
                             # Sample rate is a constant scalar, keep last value.
                             self.mm_accumulated[k] = v[-1]