[kupfer] Define a dummy gettext function in kupfer.obj.base if needed

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 8e42b8f86f3ef3cd12f569f7ffcf992142e75479
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Wed Feb 10 23:46:38 2010 +0100

    Define a dummy gettext function in kupfer.obj.base if needed
    
    If the kupfer.obj.base module is loaded without us having a gettext
    function installed, we install a dummy function at this point. This
    makes sure all core object code can be tested properly (without
    localization of course).

 kupfer/obj/base.py |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/obj/base.py b/kupfer/obj/base.py
index 80b2df3..411438d 100644
--- a/kupfer/obj/base.py
+++ b/kupfer/obj/base.py
@@ -8,6 +8,13 @@ __all__ = [
 	"InvalidDataError", "KupferObject", "Leaf", "Action", "Source", "TextSource"
 ]
 
+# If no gettext function is loaded at this point, we load a substitute,
+# so that testing code can still work
+import __builtin__
+if not hasattr(__builtin__, "_"):
+	def identity(x): x
+	__builtin__._ = identity
+
 class Error (Exception):
 	pass