Merge pull request #420 from palewire/patch-16

Fix None check in update_chart to work with DataFrames

Author: chekos

datawrapper/__main__.py

@@ -809,7 +809,7 @@ def update_chart(
             obj = self.get_chart(chart_id)
 
         # Add data, if provided
-        if data:
+        if data is not None:
             self.add_data(chart_id=obj["id"], data=data)
 
         # Return the result