Do not permit empty python namespace names

src/jcloud_docsgen/core/python/namespaces.py

@@ -37,6 +37,7 @@ class PythonNamespace:
 
         self.name = name
 
+
 class PythonPackageNamespace(PythonNamespace):
     '''
     A subclass of ``PythonNamespace`` for python package namespaces.