Add missing option_spec for Python domain.

sphinx/domains/python.py

@@ -40,6 +40,10 @@ class PyObject(ObjectDescription):
     """
     Description of a general Python object.
     """
+    option_spec = {
+        'noindex': directives.flag,
+        'module': directives.unchanged,
+    }
 
     doc_field_types = [
         TypedField('parameter', label=l_('Parameters'),

tests/root/objects.txt

@@ -10,6 +10,8 @@ Testing object descriptions
 .. function:: func_noindex
    :noindex:
 
+.. function:: func_with_module
+   :module: foolib
 
 .. module:: mod
    :synopsis: Module synopsis.