Try to debug failure

.travis.yml

@@ -52,6 +52,8 @@ jobs:
         - doit develop_install -o recommended -o tests -o build $CHANS_DEV
         - pip install codecov altair
         - doit env_capture
+        - jupyter nbconvert --to notebook --ExecutePreprocessor.allow_errors=True --execute examples/user_guide/Introduction.ipynb
+        - cat examples/user_guide/Introduction.ipynb | xargs echo -e
       script: doit test_all_recommended
       after_failure:
         - sleep 10

examples/user_guide/Introduction.ipynb

@@ -53,6 +53,15 @@
     "pn.interact(sine)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%tb"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -263,7 +272,10 @@
     "def hvplot(df, **kwargs):\n",
     "    return df.hvplot()\n",
     "\n",
-    "pn.interact(sine, view_fn=hvplot)"
+    "try:\n",
+    "    display(pn.interact(sine, view_fn=hvplot))\n",
+    "except Exception as e:\n",
+    "    print(e)"
    ]
   },
   {

panel/__init__.py

@@ -49,10 +49,7 @@ def __call__(self, *args, **params):
             #       to allow multiple cleanup comms to be registered
             JupyterCommManager.get_client_comm(self._process_comm_msg,
                                                "hv-extension-comm")
-        try:
-            _load_nb(p.inline)
-        except:
-            pass
+        _load_nb(p.inline)
         self._loaded = True
 
         Viewable._comm_manager = JupyterCommManager