[orca] Add sanity check when checking if an object is a spellcheck suggestion

[Joanmarie Diggs <joanied src gnome org>]

commit 6277308118037b1aece874f9ad83dfec462d00df
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Feb 15 00:20:18 2016 -0500

    Add sanity check when checking if an object is a spellcheck suggestion

 src/orca/spellcheck.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/spellcheck.py b/src/orca/spellcheck.py
index 00e17ee..ac2e125 100644
--- a/src/orca/spellcheck.py
+++ b/src/orca/spellcheck.py
@@ -126,6 +126,9 @@ class SpellCheck:
         return False
 
     def isSuggestionsItem(self, obj):
+        if not self._suggestionsList:
+            return False
+
         return obj and obj.parent == self._suggestionsList
 
     def presentContext(self):