fix for AttributeError: 'NoneType' object has no attribute 'is_db_ready'

File "/home/user/app/app.py", line 95, in chat_with_pdf

if not state.is_db_ready():

AttributeError: 'NoneType' object has no attribute 'is_db_ready'

app.py

@@ -45,7 +45,8 @@ def process_pdf(pdf_file, state):
         if state.is_db_ready():
             return (
                 gr.update(interactive=False),
-                gr.update(visible=True)
+                gr.update(visible=True),
+                state
             )
 
         # Create a new session and directory for the user
@@ -74,10 +75,11 @@ def process_pdf(pdf_file, state):
 
         gr.Info("PDF processed successfully! You can now ask questions about the document.")
 
-        # Return updates to the UI components
+        # Return updates to the UI components and the new state
         return (
             gr.update(interactive=False),
-            gr.update(visible=True)
+            gr.update(visible=True),
+            state
         )
     except Exception as e:
         # Clean up the directory in case of an error
@@ -87,7 +89,8 @@ def process_pdf(pdf_file, state):
         # Re-enable the file upload in case of error
         return (
             gr.update(interactive=True),
-            gr.update(visible=False)
+            gr.update(visible=False),
+            state
         )
 
 # Function to handle user queries
@@ -159,7 +162,7 @@ with gr.Blocks(title="PDF Chatbot") as demo:
     file_upload_input.upload(
         fn=process_pdf,
         inputs=[file_upload_input, state],
-        outputs=[file_upload_input, chat_interface]
+        outputs=[file_upload_input, chat_interface, state]
     )
 
 demo.launch()