Fix missing versions key

Author: jugmac00

docs/conf.py

@@ -35,6 +35,11 @@
 # a list of builtin themes.
 html_theme = 'flask'
 
+# Context for the theme
+html_context = {
+    'versions': [],
+}
+
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
 # html_title = None