Update main.py

main.py

@@ -58,9 +58,9 @@ async def searches(request: Request):
 
 class User(BaseModel):
     prompt: str
-    model: str
-    sampler: str
-    seed: int
+    model: str = None
+    sampler: str = None
+    seed: int = None
     neg: str = None
 
 @app.post("/imagen")