[orca] Control an exception for avoiding to show a Python's traceback to the user. This is related with the

[Juanje Ojeda Croissier <jojeda src gnome org>]

commit da4a174b3e8c87357959efefecdb0193e1983425
Author: Juanje Ojeda <jojeda emergya es>
Date:   Tue Jul 27 19:56:32 2010 +0200

    Control an exception for avoiding to show a Python's traceback to the user.
    This is related with the 25th comentary of bgo #596108

 src/orca/orca.py |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/orca.py b/src/orca/orca.py
index 06de5b4..038fc79 100644
--- a/src/orca/orca.py
+++ b/src/orca/orca.py
@@ -1988,7 +1988,15 @@ def main():
                 userPrefsDir = os.path.join(xdg_data_home, "orca")
                 oldUserPrefsDir = os.path.join(os.environ["HOME"], ".orca")
                 if os.path.exists(oldUserPrefsDir):
-                    os.renames(oldUserPrefsDir, userPrefsDir)
+                    try:
+                        os.renames(oldUserPrefsDir, userPrefsDir)
+                    except:
+                       print "It seems like you are trying to migrate your " \
+                           + "preferences but the new location is not " \
+                           + "empty.\n" \
+                           + "Probably it was already migrated. \n" \
+                           + "Please, check it before you try again."
+                       die(2)
                 settings.userPrefsDir = userPrefsDir
 
             if opt in ("-e", "--enable"):