Fixed context expansion bug for new corpora

Change-Id: Id56324f94ef9a85815b38479f289f57c7ffd58b6
diff --git a/Changes b/Changes
index 1bf1d78..6959658 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.52 2015-07-02
+0.52 2015-07-08
         - [bugfix] Fixed payload filtering in FocusSpans (margaretha)
 	- [workaround] Reintroduced empty collection support,
 	  as Koral still creates them (diewald)
@@ -26,6 +26,7 @@
 	- [feature] Support '@all' as a 'fields' value for all meta
 	  data fields (diewald)
 	- [bugfix] Fix case sensitivity bug in filters (diewald)
+	- [bugfix] Fix sentence expansion bug for new data (diewald)
 
 0.51 2015-03-17
         - This is a major version (prepared for the GitHub release)