fix exception related to the pix2pix

modules/sd_hijack.py

@@ -256,8 +256,12 @@ class StableDiffusionModelHijack:
 
         self.layers = flatten(m)
 
+        import modules.models.diffusion.ddpm_edit
+
         if isinstance(m, ldm.models.diffusion.ddpm.LatentDiffusion):
             sd_unet.original_forward = ldm_original_forward
+        elif isinstance(m, modules.models.diffusion.ddpm_edit.LatentDiffusion):
+            sd_unet.original_forward = ldm_original_forward
         elif isinstance(m, sgm.models.diffusion.DiffusionEngine):
             sd_unet.original_forward = sgm_original_forward
         else: