Patch for pytac version on pypi.

docs/conf.py

@@ -21,23 +21,18 @@
 
 # If we cannot import pytac or at then mock them. This is a temporary fix
 # because at is not on pypi.
-MOCK_MODULES = []
+class FieldException(Exception):
+    pass
+
+import pytac
+pytac.exceptions.FieldException = FieldException
 
 class Mock(MagicMock):
     @classmethod
     def __getattr__(cls, name):
         return MagicMock()
 
-try:
-    import pytac
-except ImportError:
-    MOCK_MODULES.append('pytac')
-try:
-    import at
-except ImportError:
-    MOCK_MODULES.append('at')
-
-sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+sys.modules.update(('at', Mock()))
 
 # -- Project information -----------------------------------------------------