Index: trunk/tools/czartool/CzarDb.pm
===================================================================
--- trunk/tools/czartool/CzarDb.pm	(revision 28768)
+++ trunk/tools/czartool/CzarDb.pm	(revision 28770)
@@ -44,5 +44,4 @@
     if (!$query->execute) {
 
-        print "WARNING: getCurrentLabels() failed\n";
         return 0;
     }
@@ -181,8 +180,11 @@
 SQL
 
-    $query->execute;
+    if (!$query->execute) {return undef;}
+
     my $minProcessed;
 
     ($minProcessed, ${$maxY}, ${$minY}, ${$maxX}, ${$minX}, ${$timeDiff}) = $query->fetchrow_array();
+
+    if (!$minProcessed) {return undef;}
 
     $query = $self->{_db}->prepare(<<SQL);