Fix OpenAI client initialization and PDF handling

app.py

@@ -16,6 +16,8 @@ WEAVIATE_API_KEY = os.getenv("WEAVIATE_API_KEY")
 print("Testing Weaviate connection...")
 print("URL:", WEAVIATE_URL)
 print("API KEY:", "SET" if WEAVIATE_API_KEY else "MISSING")
+print("OPENAI_API_KEY:", "SET" if OPENAI_API_KEY else "MISSING")
+
 
 # Connect to Weaviate Cloud
 client = weaviate.connect_to_weaviate_cloud(
@@ -24,8 +26,12 @@ client = weaviate.connect_to_weaviate_cloud(
     skip_init_checks=True
 )
 
+openai_client = OpenAI(api_key=OPENAI_API_KEY)
+
 # Load and process PDF
 def extract_text_from_pdf(pdf_path):
+    if not pdf_path or not os.path.exists(pdf_path):
+        raise ValueError(f"No PDF file provided")
     reader = PdfReader(pdf_path)
     text = ""
     for page in reader.pages:
@@ -104,6 +110,8 @@ def ask_question(query):
 #Gradio App
 def process_pdf(pdf_file):
     try:
+        if not pdf_file:
+            return "❌ No file uploaded"
         setup_schema()
         # pdf_file is already a string path because of type="filepath"
         text = extract_text_from_pdf(pdf_file)
@@ -133,5 +141,5 @@ with gr.Blocks() as demo:
         ask_btn = gr.Button("Ask")
         ask_btn.click(qa_pipeline, inputs=question, outputs=answer)
 
-demo.launch()
+demo.launch(share=True)
 client.close()