Add UnCLIPImageVariationPipeline to dummy imports (#1897)

* Add UnCLIPImageVariationPipeline to dummy imports

* style

src/diffusers/pipelines/unclip/__init__.py

@@ -10,7 +10,7 @@ try:
     if not (is_transformers_available() and is_torch_available() and is_transformers_version(">=", "4.25.0")):
         raise OptionalDependencyNotAvailable()
 except OptionalDependencyNotAvailable:
-    from ...utils.dummy_torch_and_transformers_objects import UnCLIPPipeline
+    from ...utils.dummy_torch_and_transformers_objects import UnCLIPImageVariationPipeline, UnCLIPPipeline
 else:
     from .pipeline_unclip import UnCLIPPipeline
     from .pipeline_unclip_image_variation import UnCLIPImageVariationPipeline