Fix eplb nvfp4 experts hook (#37217)

Signed-off-by: Elvir Crncevic <elvircrn@gmail.com>
Signed-off-by: Elvir Crncevic <elvir@anthropic.com>
Co-authored-by: Tyler Michael Smith <tyler@neuralmagic.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

vllm/model_executor/layers/fused_moe/modular_kernel.py

@@ -489,6 +489,9 @@ class FusedMoEExperts(ABC):
         self.max_num_tokens = max_num_tokens
         self.num_dispatchers = num_dispatchers
 
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:  # noqa: B027
+        pass
+
     @staticmethod
     def is_monolithic() -> bool:
         raise NotImplementedError("Implemented by subclasses.")