Ensured callbacks are robust to missing underscore.js

holoviz · Jul 1, 2016 · 5c2b39b · 5c2b39b
1 parent fe02563
commit 5c2b39b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/holoviews/plotting/bokeh/callbacks.py b/holoviews/plotting/bokeh/callbacks.py
@@ -105,7 +105,7 @@ class Callback(param.ParameterizedFunction):
         }}
 
         timeout = HoloViewsWidget._timeout + {timeout};
-        if (_.isEmpty(data)) {{
+        if ((typeof _ === "undefined")  || _.isEmpty(data)) {{
         }} else if ((HoloViewsWidget._blocked && (Date.now() < timeout))) {{
             HoloViewsWidget._queued = [data];
         }} else {{