Remove DPM2 schedulers

lib/config.py

@@ -6,8 +6,6 @@ from diffusers import (
     DPMSolverMultistepScheduler,
     EulerAncestralDiscreteScheduler,
     EulerDiscreteScheduler,
-    KDPM2AncestralDiscreteScheduler,
-    KDPM2DiscreteScheduler,
     StableDiffusionXLImg2ImgPipeline,
     StableDiffusionXLPipeline,
 )
@@ -40,8 +38,6 @@ Config = SimpleNamespace(
         "DDIM": DDIMScheduler,
         "DEIS 2M": DEISMultistepScheduler,
         "DPM++ 2M": DPMSolverMultistepScheduler,
-        "DPM2": KDPM2DiscreteScheduler,
-        "DPM2 a": KDPM2AncestralDiscreteScheduler,
         "Euler": EulerDiscreteScheduler,
         "Euler a": EulerAncestralDiscreteScheduler,
     },

lib/loader.py

@@ -174,7 +174,8 @@ class Loader:
                 print(f"{'Enabling' if karras else 'Disabling'} Karras sigmas...")
             if not same_scheduler or not same_karras:
                 self.pipe.scheduler = Config.SCHEDULERS[scheduler](**scheduler_kwargs)
-                self.refiner.scheduler = self.pipe.scheduler
+                if self.refiner is not None:
+                    self.refiner.scheduler = self.pipe.scheduler
 
         # https://huggingface.co/stabilityai/stable-diffusion-xl-refiner-1.0/blob/main/model_index.json
         refiner_kwargs = {