fixes type and closes #3756

Author: nicolaskruchten

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

@@ -20,7 +20,7 @@
 
 _mathjax_config = """\
 <script type="text/javascript">\
-if (window.MathJax && window.MathJax.Hub && && window.MathJax.Hub.Config) {window.MathJax.Hub.Config({SVG: {font: "STIX-Web"}});}\
+if (window.MathJax && window.MathJax.Hub && window.MathJax.Hub.Config) {window.MathJax.Hub.Config({SVG: {font: "STIX-Web"}});}\
 </script>"""