catch null mapping

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@13900 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/chado/ChadoTransactionManager.java

@@ -1965,6 +1965,11 @@ public class ChadoTransactionManager
       {
         Hashtable mappingIds = feature.getNewIdMapToOldId();
         
+        if(mappingIds == null)
+        {
+          logger4j.debug("No mapping found.");
+          return;
+        }
         Object newKeys[] = segmentRangeStore.keySet().toArray();
         uniqueName = new String[newKeys.length];
         oldUniqueNames = new String[newKeys.length];