Update app.py

app.py

@@ -22,7 +22,8 @@ def find_layout(image, mode):
     print("The variable image is of type:", type(image))
     print("The variable img is of type:", type(img))
 
-    mode = mode[0]
+    if mode is not None
+        mode = mode[0]
     print("Mode: ", mode)
     if mode=="LayoutAnalysis":
         table_engine = PPStructure(table=False, ocr=False, show_log=True)