Update app.py

app.py

@@ -89,12 +89,13 @@ def main():
   k1= 5
   text_list = []
   causal_sents = []
-  uploaded_file = PdfReader('sample_anno.pdf')
-  #try:
+  #uploaded_file = PdfReader('sample_anno.pdf')
+  try:
   #if uploaded_file is not None:
-  uploaded_file = st.sidebar.file_uploader("Choose a file", type = "pdf")
+      uploaded_file = st.sidebar.file_uploader("Choose a file", type = "pdf")
     #st.stop()
-  #else:
+  except:
+      uploaded_file = PdfReader('sample_anno.pdf')
   #except:
     #if uploaded_file 
     #st.write("Upload a pdf file...")