Fix type checking in config notebook

Author: jenshnielsen

docs/examples/basic_examples/Configuring_QCoDeS.ipynb

@@ -553,10 +553,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
+    "if qc.config.current_config is None:\n",
+    "    raise RuntimeError(\"No current QCoDeS configuration is set.\")\n",
     "qc.config.current_config.core.loglevel = \"INFO\""
    ]
   },
@@ -585,7 +587,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -603,6 +605,8 @@
     }
    ],
    "source": [
+    "if qc.config.current_config is None:\n",
+    "    raise RuntimeError(\"No current QCoDeS configuration is set.\")\n",
     "qc.config.current_config.core.loglevel = \"YOLO\"\n",
     "qc.config.validate()\n",
     "# NOTE that you how have a broken config!"