Update app.py

app.py

@@ -44,10 +44,13 @@ from langchain_text_splitters import NLTKTextSplitter
 
 uploaded_file = st.file_uploader("Choose a pdf file",type = "pdf")
 
-pdf_loader = PDFMinerLoader(uploaded_file)
-dat_nik = pdf_loader.load()
-text_splitter = NLTKTextSplitter(chunk_size = 500,chunk_overlap = 100)
-chunks = test_splitter.split_documents(dat_nik)
+if uploaded_file is not None:
+    pdf_loader = PDFMinerLoader(uploaded_file)
+    dat_nik = pdf_loader.load()
+    text_splitter = NLTKTextSplitter(chunk_size = 500,chunk_overlap = 100)
+    chunks = test_splitter.split_documents(dat_nik)
+else:
+    st.write("Please upload a pdf")
     
 # dat = PDFMinerLoader("2404.07143.pdf")
 # dat_nik =dat.load()