refactor: Ensure data_input is always a list in RecursiveCharacterTextSplitterComponent

To prevent potential errors, this refactor ensures that the `data_input` attribute in the `RecursiveCharacterTextSplitterComponent` class is always a list. If it is not already a list, it is converted to a list before processing. This change improves the reliability and consistency of the code.

src/backend/base/langflow/components/textsplitters/RecursiveCharacterTextSplitter.py

@@ -73,6 +73,8 @@ class RecursiveCharacterTextSplitterComponent(Component):
             chunk_overlap=self.chunk_overlap,
         )
         documents = []
+        if not isinstance(self.data_input, list):
+            self.data_input = [self.data_input]
         for _input in self.data_input:
             if isinstance(_input, Data):
                 documents.append(_input.to_lc_document())