Add empty latent node for Sana

Also remove unused display name mappings

Sana/nodes.py

@@ -1,5 +1,6 @@
 import torch
 import folder_paths
+from nodes import EmptyLatentImage
 
 from .conf import sana_conf, sana_res
 from .loader import load_sana
@@ -36,6 +37,15 @@ class SanaCheckpointLoader:
 		return (model,)
 
 
+class EmptySanaLatentImage(EmptyLatentImage):
+	CATEGORY = "ExtraModels/Sana"
+	TITLE = "Empty Sana Latent Image"
+
+	def generate(self, width, height, batch_size=1):
+		latent = torch.zeros([batch_size, 32, height // 32, width // 32], device=self.device)
+		return ({"samples":latent}, )
+
+
 class SanaResolutionSelect():
 	@classmethod
 	def INPUT_TYPES(s):
@@ -138,11 +148,5 @@ NODE_CLASS_MAPPINGS = {
 	"SanaResolutionSelect" : SanaResolutionSelect,
 	"SanaTextEncode" : SanaTextEncode,
 	"SanaResolutionCond" : SanaResolutionCond,
-}
+	"EmptySanaLatentImage": EmptySanaLatentImage,
-
-NODE_DISPLAY_NAME_MAPPINGS = {
-    "Sana Checkpoint Loader": "SanaCheckpointLoader",
-    "Sana Resolution Select": "SanaResolutionSelect",
-    "Sana Text Encoder": "SanaTextEncode",
-    "Sana Resolution Cond": "SanaResolutionCond",
 }