Add debug and fix build hopefully

docs/source/conf.py

@@ -87,8 +87,10 b' def is_stable(extra):'
 
 if is_stable(iprelease['_version_extra']):
     tags.add('ipystable')
+    print('Adding Tag: ipystable')
 else:
     tags.add('ipydev')
+    print('Adding Tag: ipydev')
     rst_prolog += """
 .. warning::
 

docs/source/whatsnew/index.rst

@@ -21,6 +21,7 b" What's new in IPython"
    Developpement version in-progress features:
    
    .. toctree::
+
       development
 
 ..
@@ -31,6 +32,7 b" What's new in IPython"
 
    .. toctree::
       :hidden:
+
       development
 
 This section documents the changes that have been made in various versions of