[modular]some small fix (huggingface#12307)

* fix

* add mellon node registry

* style

* update docstring to include more info!

* support custom node mellon

* HTTPErrpr -> HfHubHTTPErrpr

* up

* Update src/diffusers/modular_pipelines/qwenimage/node_utils.py

Author: yiyixuxu

src/diffusers/modular_pipelines/flux/modular_pipeline.py

@@ -32,6 +32,8 @@ class FluxModularPipeline(ModularPipeline, FluxLoraLoaderMixin, TextualInversion
     </Tip>
     """
 
+    default_blocks_name = "FluxAutoBlocks"
+
     @property
     def default_height(self):
         return self.default_sample_size * self.vae_scale_factor