fix: Remove empty block of code in the end

Author: raphtrajano

notebooks/4-Cascade_classification.ipynb

@@ -534,19 +534,6 @@
       "source": [
         "[Previous](3-Features.ipynb)"
       ]
-    },
-    {
-      "cell_type": "code",
-      "metadata": {
-        "id": "brEjJJw8P8BD",
-        "colab_type": "code",
-        "colab": {}
-      },
-      "source": [
-        ""
-      ],
-      "execution_count": 0,
-      "outputs": []
     }
   ]
 }