add text for empty dataset

app.py

@@ -78,4 +78,6 @@ if max_docs > 0:
         st.code(example["content"], language=chosen_language)
     else:
         st.text(f"File can't be lexed so we remove syntax highlighting.\nContent:\n")
-        st.text(str(example["content"]))
+        st.text(str(example["content"]))
+else:
+    st.text("The dataset is empty after the filtering!")