[V1] Fix multimodal profiling for Molmo (#11325)

Signed-off-by: ywang96 <ywang@example.com>
Co-authored-by: ywang96 <ywang@example.com>

vllm/model_executor/models/molmo.py

@@ -928,7 +928,11 @@ def image_input_mapper_for_molmo(
     data: object,
 ):
     if isinstance(data, list):
+        assert len(data) == 1, "Molmo supports only one image per prompt."
         data = data[0]
+
+    # Remove unused dummy PIL image
+    data.pop('raw_mm_data', None)
     return MultiModalKwargs(data)
 
 
@@ -974,6 +978,7 @@ def dummy_data_for_molmo(ctx: InputContext, seq_len: int,
     dummy_imgdata = {
         "images": out["images"],
         "image_input_idx": out["image_input_idx"],
+        "raw_mm_data": dummy_image,
     }
     if "image_masks" in out:
         dummy_imgdata["image_masks"] = out["image_masks"]