Update app.py

app.py

@@ -34,7 +34,7 @@ def generate_plots(min_slider_samples_range,max_slider_samples_range):
           oa.fit(X)
           oa_mse[i, j] = oa.error_norm(real_cov, scaling=False)
           oa_shrinkage[i, j] = oa.shrinkage_
-  return
+    return