Fix single batches

pipeline.py

@@ -28,6 +28,10 @@ from diffusers.utils.import_utils import is_xformers_available
 
 
 def to_rgb_image(maybe_rgba: Image.Image):
+    if isinstance(maybe_rgba, list):
+        if len(maybe_rgba > 1):
+            assert "Batch sizes are not supported!"
+        maybe_rgba = maybe_rgba[0]
     if maybe_rgba.mode == 'RGB':
         return maybe_rgba
     elif maybe_rgba.mode == 'RGBA':
@@ -326,8 +330,8 @@ class Zero123PlusPipeline(diffusers.StableDiffusionPipeline):
     @torch.no_grad()
     def __call__(
         self,
+        image: Image.Image = None,
         prompt = "",
-        image = None,
         *args,
         num_images_per_prompt: Optional[int] = 1,
         guidance_scale=4.0,