update changelog

Signed-off-by: Vladimir Mandic <mandic00@live.com>

CHANGELOG.md

@@ -36,7 +36,8 @@
   - added **ROCm** receipe
   - added **IPEX** receipe
   - added **OpenVINO** receipe
-- **Backend**  
+- **System**  
+  - improve **python==3.12** compatibility  
   - **Torch**  
     - for **zluda** set default to `torch==2.6.0+cu118`  
     - for **openvino** set default to `torch==2.6.0+cpu`  

modules/control/units/controlnet.py

@@ -342,8 +342,10 @@ class ControlNetPipeline():
                 cls = StableDiffusionXLControlNetUnionPipeline
                 if len(controlnets) > 1:
                     # TODO controlnet-union multi-unit
+                    controlnets = controlnets[0]
                     log.warning(f'Control {what}: units={classes} supports single unit only')
-                # controlnets = controlnets[0]
+                else:
+                    controlnets = controlnets[0]
             else:
                 cls = StableDiffusionXLControlNetPipeline
             self.pipeline = cls(