Fixing looking for non existant directory for Sphinx

doc/conf/conf.py

@@ -124,7 +124,7 @@ html_theme = 'sphinxdoc'
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = list()
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.