[2/N] Initialize MM components in context managers (E-H) (#32641)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/model_executor/models/aria.py

@@ -590,8 +590,6 @@ class AriaForConditionalGeneration(nn.Module, SupportsMultiModal):
     def _process_image_input(
         self, image_input: AriaImagePixelInputs
     ) -> tuple[torch.Tensor, torch.Tensor]:
-        assert self.vision_tower is not None
-
         pixel_values = image_input["pixel_values"]
         pixel_mask = image_input["pixel_mask"]