hps-java/src/main/java/org/lcsim/hps/recon/tracking

diff -u -r1.9 -r1.10
--- HPSHelicalTrackHitDriver.java	30 Jul 2012 22:27:09 -0000	1.9
+++ HPSHelicalTrackHitDriver.java	31 Jul 2012 21:30:33 -0000	1.10
@@ -127,6 +127,10 @@

 
         for (String _colname : _colnames) {
 

+            if (!event.hasCollection(SiTrackerHit.class, _colname)) {
+                continue;
+            }
+

             //  Get the list of SiTrackerHits for this collection
             List<SiTrackerHit> hitlist = (List<SiTrackerHit>) event.get(_colname);
 

hps-java/src/main/java/org/lcsim/hps/recon/tracking

diff -u -r1.20 -r1.21
--- TrackerReconDriver.java	24 May 2012 14:34:00 -0000	1.20
+++ TrackerReconDriver.java	31 Jul 2012 21:30:33 -0000	1.21
@@ -139,6 +139,7 @@

         //
         // TODO Make this step its own separate Driver??? (Matt)
         add(hthdriver);

+        hthdriver.addCollection(simTrackerHitCollectionName);

 
         //
         // 2) Driver to run Seed Tracker.