[Bugfix] Fix MRoPE Errors in the Qwen-VL Model When Processing Pure Text (#18407)

Co-authored-by: 松灵 <wpf272043@alibaba-inc.com>

Author: wulipc

vllm/worker/model_runner.py

@@ -729,8 +729,6 @@ def _compute_multi_modal_input(self, inter_data: InterDataForSeqGroup,
  mm_kwargs, placeholder_maps = MultiModalPlaceholderMap.from_seq_group(
  seq_group_metadata,
  range(positions[0], positions[0] + len(positions)))
- if not mm_kwargs:
- return
 
  inter_data.multi_modal_kwargs = mm_kwargs
  inter_data.multi_modal_placeholder_maps = placeholder_maps
@@ -741,12 +739,6 @@ def _compute_multi_modal_input(self, inter_data: InterDataForSeqGroup,
  video_grid_thw = mm_kwargs.get("video_grid_thw", None)
  audio_feature_lengths = mm_kwargs.get("audio_feature_lengths",
  None)
- assert (
- image_grid_thw is not None or video_grid_thw is not None
- or audio_feature_lengths is not None), (
- "mrope embedding type requires multi-modal input mapper "
- "returns 'image_grid_thw' or 'video_grid_thw' or "
- "'audio_feature_lengths'.")
 
  second_per_grid_ts = mm_kwargs.get("second_per_grid_ts", None)
  use_audio_in_video = mm_kwargs.get("use_audio_in_video", False)