🐛 fix(base.py): set default value of frontend_node to None in ValidatePromptRequest class to avoid potential NoneType errors

🐛 fix(validate.py): set frontend_node to None instead of an empty dictionary in post_validate_prompt function to align with the default value in ValidatePromptRequest class

src/backend/langflow/api/v1/base.py

@@ -22,7 +22,7 @@ class ValidatePromptRequest(BaseModel):
     name: str
     template: str
     # optional for tweak call
-    frontend_node: Optional[FrontendNodeRequest]
+    frontend_node: Optional[FrontendNodeRequest] = None
 
 
 # Build ValidationResponse class for {"imports": {"errors": []}, "function": {"errors": []}}

src/backend/langflow/api/v1/validate.py

@@ -35,7 +35,7 @@ def post_validate_prompt(prompt_request: ValidatePromptRequest):
         if prompt_request.frontend_node is None:
             return PromptValidationResponse(
                 input_variables=input_variables,
-                frontend_node={},
+                frontend_node=None,
             )
         old_custom_fields = get_old_custom_fields(prompt_request)