Set cell_number to 0 if history is not available

Author: abdelq

Diff for: packages/python/plotly/plotly/io/_base_renderers.py

@@ -608,12 +608,15 @@ def to_mimebundle(self, fig_dict):
         return {"text/html": iframe_html}
 
     def build_filename(self):
-        ip = IPython.get_ipython() if IPython else None
-        cell_number = list(ip.history_manager.get_tail(1))[0][1] + 1 if ip else 0
-        filename = "{dirname}/figure_{cell_number}.html".format(
+        if IPython:
+            ip = IPython.get_ipython()
+            cell_number = next(ip.history_manager.get_tail(1), (0, -1, ""))[1] + 1
+        else:
+            cell_number = 0
+
+        return "{dirname}/figure_{cell_number}.html".format(
             dirname=self.html_directory, cell_number=cell_number
         )
-        return filename
 
     def build_url(self, filename):
         return filename