[Misc] skip target model mm emb in draft proposal step when draft is text-only (#33437)

Signed-off-by: kkt-cohere <komal@cohere.com>

vllm/v1/worker/gpu_model_runner.py

@@ -4070,7 +4070,7 @@ class GPUModelRunner(
                     else:
                         target_hidden_states = hidden_states[:total_num_tokens]
 
-            if self.supports_mm_inputs:
+            if self.supports_mm_inputs and self.drafter.supports_mm_inputs:
                 mm_embed_inputs = self._gather_mm_embeddings(
                     scheduler_output,
                     shift_computed_tokens=1,