chore: ballons and warning refactor

pages/1_📈_Plotting.py

@@ -59,11 +59,11 @@ if not df_base.empty:
         st.write(f"Action: {plot} using {n_plot} samples")
         plot_it = st.button("Plot now! 📊")
         if plot_it:
+            st.balloons()
             with st.spinner(f"Drawing plot to visualize {plot.lower()}"):
-                while True:
-                    time.sleep(4)
-            # create a DataFrame with each run in the columns (depending on n)
+                time.sleep(4)
+            # create a DF with each run in the columns (depending on n)
             with st.expander("See explanation"):
                 st.write("The chart above shows...")
-else:
+elif df_base.empty and file:
     st.warning("Consider running outlier detection to clean your data!", icon="⚠️")