When listing recent experiments for the reservation list, need to watch

for experiments with nodes reserved that have never been swapped
in. Happens in the emulab-ops project, we nalloc nodes to experiments
that like hwdown.

db/Project.pm.in

 #!/usr/bin/perl -wT
 #
-# Copyright (c) 2005-2017 University of Utah and the Flux Group.
+# Copyright (c) 2005-2018 University of Utah and the Flux Group.
 # 
 # {{{EMULAB-LICENSE
 # 
@@ -1051,6 +1051,10 @@ sub Usage($$$)
     while (my ($eid,$idx,$urn,$slice_uuid,
 	       $swapin_time,$swapout_time,$type,$count) =
 	   $query_result->fetchrow_array()) {
+	# In the emulab-ops project, we nalloc nodes to experiments that
+	# have never been swapped in (like hwdown).
+	next
+	    if (!defined($swapin_time));
 	# No phys nodes.
 	next
 	    if ($count == 0 || !defined($type));