Cleaned up cleanup section (#291)

notebooks/notebook_template.ipynb

@@ -675,9 +675,6 @@
       },
       "outputs": [],
       "source": [
-        "# Warning: Setting this to true will delete everything in your bucket\n",
-        "delete_bucket = False\n",
-        "\n",
         "# Delete endpoint resource\n",
         "! gcloud ai endpoints delete $ENDPOINT_NAME --quiet --region $REGION_NAME\n",
         "\n",
@@ -687,7 +684,7 @@
         "# Delete Cloud Storage objects that were created\n",
         "! gsutil -m rm -r $JOB_DIR\n",
         "\n",
-        "if delete_bucket and \"BUCKET_URI\" in globals():\n",
+        "if os.getenv(\"IS_TESTING\"):\n",
         "    ! gsutil -m rm -r $BUCKET_URI"
       ]
     }