Update app.py

app.py

@@ -103,7 +103,10 @@ def read_document(file, clean=True):
 
     kind = filetype.guess(file_content)
 
-    mime = kind.mime
+    if kind is None:
+        mime = "text"
+    else:
+        mime = kind.mime
 
     if mime == "application/pdf":
         # PDF Handling (unchanged)