🔧 chore(base.py): refactor code to improve readability and handle optional parameters

📝 chore(base.py): update comments and remove unused imports
The code in the `Vertex` class has been refactored to improve readability and handle optional parameters more effectively. The code now checks if a parameter is of type "code", "str", or "prompt" and if it is not already set in the `params` dictionary, it sets it to the corresponding value from the `value` dictionary. Additionally, if a parameter is not required and not set in the `params` dictionary, it checks if a default value is provided and sets it to the default value if available, otherwise it removes the parameter from the `params` dictionary. This change improves the handling of optional parameters and makes the code more maintainable.

src/backend/langflow/graph/vertex/base.py

@@ -1,5 +1,6 @@
 from langflow.interface.initialize import loading
 from langflow.interface.listing import ALL_TYPES_DICT
+from langflow.utils.constants import DIRECT_TYPES
 from langflow.utils.logger import logger
 from langflow.utils.util import sync_to_async
 
@@ -110,11 +111,14 @@ class Vertex:
                 file_path = value.get("file_path")
 
                 params[key] = file_path
-            elif (
-                value.get("type") in ["code", "str", "prompt"]
-                and params.get(key) is None
-            ):
+            elif value.get("type") in DIRECT_TYPES and params.get(key) is None:
                 params[key] = value.get("value")
+
+            if not value.get("required") and params.get(key) is None:
+                if value.get("default"):
+                    params[key] = value.get("default")
+                else:
+                    params.pop(key, None)
         # Add _type to params
         self.params = params