[bugfix] fix image_list qwen2.5-omni (#6122)

Author: Jintao-Huang

swift/llm/template/template/qwen.py

@@ -536,7 +536,10 @@ def replace_tag(self, media_type: Literal['image', 'video', 'audio'], index: int
                 return ['<|audio_start|><|audio_pad|><|audio_end|>']
         elif media_type == 'video':
             video = inputs.videos[index]
-            inputs.videos[index] = fetch_video({'video': video}).to(torch.uint8)
+            _video = fetch_video({'video': video})
+            if isinstance(_video, torch.Tensor):
+                _video = _video.to(torch.uint8)
+            inputs.videos[index] = _video
             if self.use_audio_in_video:
                 import librosa
                 if video.startswith('http://') or video.startswith('https://'):