[orca] Fix for bug #640135 - Generator Cache can get cleared in the midst of getting the mnemonic, shortcut

[Joanmarie Diggs <joanied src gnome org>]

commit cf512709eea843d12fc81e62d9bf53139b7d0714
Author: Joanmarie Diggs <joanmarie diggs gmail com>
Date:   Fri Jan 21 01:13:08 2011 -0500

    Fix for bug #640135 - Generator Cache can get cleared in the midst of getting the mnemonic, shortcut, and accelerator

 src/orca/script_utilities.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index d921a91..577b010 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -2726,6 +2726,9 @@ class Utilities:
         debug.println(debug.LEVEL_FINEST, "script_utilities.getKeyBinding: " \
                       + repr([mnemonic, fullShortcut, accelerator]))
 
+        if not self._script.generatorCache.has_key(self.KEY_BINDING):
+            self._script.generatorCache[self.KEY_BINDING] = {}
+
         self._script.generatorCache[self.KEY_BINDING][obj] = \
             [mnemonic, fullShortcut, accelerator]
         return self._script.generatorCache[self.KEY_BINDING][obj]